471 + Interview Questions in ALDEHYDES-AND-KETONES IN GENERAL AWARENESS Page 5 InterviewSolution

201.	Write the name of the catalyst used in Wacker Process.
Answer» Correct Answer - `PdCl_(2), CuCl_(2)`

Discussion

202.	Propanone to iodoform
Answer» Propanone to iodoform `underset("Propanone")(CH_(3)COCH_(3))underset(-3NaOH)overset(3NaOH(I_(2)//NaOH))rarrunderset("1,1,1-Tri-iodopropanone")(CH_(3)COCH_(3))underset(-CH_(3)COONa)overset("NaOH")rarrunderset("Iodoform")(CHI_(3))`

Discussion

203.	Propyne to methyl acetate
Answer» Propyne to methyl acetate `underset("Propyne")(CH_(3)C-=CH)underset(H_(2)O)overset(HgSO_(4)//H_(2)SO_(4))rarrunderset("Propanone")(CH_(3)-overset(O)overset(\|\|)(C)-CH_(3))underset(-C_(6)H_(5)COOH)overset(C_(6)H_(5)COOH)rarrunderset("Methyl acetate")(CH_(3)-overset(O)overset(\|\|)C-OCH_(3))`

Discussion

204.	Which product do you expect when non-terminal alkynes are subjected to hydroboration-oxidation?
Answer» Correct Answer - Ketones

Discussion

205.	Ethanal to lactic acid
Answer» Ethanal to lactic acid `underset("Ethanal")(CH_(3)CH)=Ooverset(HCN)rarrunderset("Ethanal cyanohydrin")(CH_(3)CH(OH)CN)overset(2H_(2)O //H^(+))rarrunderset("Lactic acid")(CH_(3)CH(OH)COOH)`

Discussion

206.	Propanal to propyne
Answer» Propanl to propyane `underset("Propanal")(CHCH_(2)CHO)overset(PCl_(5))rarrunderset(1,1-"Dichloropropane")(CH_(3)CH_(2)CHCl_(2))underset(-2KCl,-2H_(2)O)overset("2KOH(alc)")rarrunderset("Propyne")(CH_(3)C-=CH)`

Discussion

207.	Acetaldehyde to acetone
Answer» Acetaldehyde to acetone `underset("Acetaldehyde")(CH_(3)CHO)underset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))overset("Oxidation")rarrunderset("Acetic acid")(CH_(3)COOH)underset("Heat")overset(Ca(OH)_(2))rarrunderset("Cal. acetate")((CH_(3)COO)_(2)Ca)underset(-CaCO_(3))overset("Heat")rarrunderset("Acetone")(CH_(3)COCH_(3))`

Discussion

208.	Formaldehyde to n-butane
Answer» Formaldehyde to n-butane `underset("Formaldehyde")(HCHO)overset(CH_(3)MgBr)underset(["Addition compound"])(CH_(3)CH_(2)OMgBr)overset(H_(2)O)rarrunderset("Ethyl alcohol")(CH_(3)CH_(2)OH)overset(PCl_(5))rarrunderset("Ethyl chloride")(CH_(3)CH_(2)Cl)underset(("Ether"))overset("Na")rarrunderset("n-Butane")(CH_(3)CH_(2)CH_(2)CH_(3))`

Discussion

209.	Among formaldehyde, acetone and acetaldehyde, the reactivity order isA. `HCHO gt (CH_(3))_(2)CO gtCH_(3)CHO`B. `HCHO gt CH_(3)CHO gt(CH_(3))_(2)CO`C. `(CH_(3))_(2)C=OgtHCHOgtCH_(3)CHO`D. Unpredictable.
Answer» Correct Answer - B The reactivity of aldehydes/ketones varies as `HCHO gt RCHO gt R_(2)C=O`

Discussion

210.	Formaldehyde to acetaldehyde
Answer» Formaldehyde to acetaldehyde `underset("Formaldehyde")(HCHO)overset(CH_(3)MgBr)rarrunderset(["Addition compound"])(CH_(3)CH_(2)OMgBr)overset(H_(2)O)rarrunderset("Ethyl alcohol")(CH_(3)CH_(2)OH) underset(K_(2)Cr_(2)O_(7)//H_(2)SO_(4))overset("Oxidation")rarrunderset("Acetaldehyde")(CH_(3)CHO)`

Discussion

211.	For obtaining ethly methyl ketone from acetyl chloride, which of the following reagents can efficiently be employed?A. One mole of `CH_(3)-Mgl`B. Reaction with HI and PC. `H_(2),Pd//BaSO_(4)`D. One mole of `C_(2)H_(5)MgBr`.
Answer» Correct Answer - D `CH_(3)COCl+C_(2)H_(5)MgBr rarr2CH_(3)COC_(2)H_(5)+Mg(Br)Cl`

Discussion

212.	Toluene reacts with chromyl chloride to form :A. Benzoic acidB. BenzeneC. BenzaldehydeD. Benzophenone.
Answer» Correct Answer - C Benzaldehyde is formed by Etard reaction.

Discussion

213.	The reagent used for the separation of acetaldehyde from acetophenone isA. `NaHSO_(3)`B. `C_(6)H_(5)NHNH_(2)`C. `NH_(2)OH`D. `NaOH//I_(2)`.
Answer» Correct Answer - A `NaHSO_(3)` reacts with acetaldehyde to form addition compound which is precipitated. Acetaldehyde can be recovered with dilute HCl. Acetophenone does not react.

Discussion

214.	The product of the following reaction are `CH_(3)C=C.CH_(2)CH_(3)=overset((i)O_(3))underset((ii)Hydrolysis)rarr?`A. `CH_(3)COOH + CO_(2)`B. `CH_(3)COOH + HOOC CH_(2)CH_(3)`C. `CH_(3)CHO + CH_(3)CH_(2)CHO`D. `CH_(3)COOH + CH_(3)COCH_(3)`.
Answer» Correct Answer - B `CH_(3)C-=C CH_(2)CH_(3)overset("Ozonolysis")rarr` `CH_(3)-overset(O)overset(\|\|)(C)-OH+CH_(3)CH_(2)-overset(O)overset(\|\|)(C)-OH`

Discussion

215.	Which of the following will be oxidised by `HIO_(4)`? (A) `R-underset(O)underset(\|\|)C-underset(O)underset(\|\|)C-R` (B) `R-underset(O)underset(\|\|)C-underset(OH)underset("\| ")"CH"-R` (C) `{:(R-CH-CH_(2)-CH-R),(" \| \|"),(" OH OH"):}` (D) `{:(R-CH-CH-R),(" \| \|"),(" OH OH"):}`A. 1, 2 and 3B. 1, 3 and 4C. 1, 2 and 4D. 2, 3 and 4.
Answer» Correct Answer - C `HIO_(4)` oxidises compounds containing two or more OH groups attached to adjacent carbon atoms or one OH and one carbonyl groups at adjacent carbon atoms or two carbonyl groups at adjacent carbon atoms.

Discussion

216.	For the given reaction, `CH_(3)CHO+CHNrarroverset(H_(3)O^(+))rarr` The products is a :A. mixture of 1:1 enantiomers of acidB. mixture of 1:1 disteromers of acidC. mixture of 1:2 enantiomers of acidD. mixture of 1:1 enantiomers of aldehyde
Answer» Correct Answer - A

Discussion

217.	Tischenko reaction of gives :A. B. C. D.
Answer» Correct Answer - D

Discussion

218.	The product formed are:A. `CH_(3)-overset(O)overset(\|\|)C-CHO`B. OHC-CHOC. `CH_(3)-overset(O)overset(\|\|)C-overset(O)overset(\|\|)C-CH_(3)`D. HCOOH
Answer» Correct Answer - A::B

Discussion

219.	The `IUPAC` name of `CH_(3)COCH(CH_(3))_(2)` isA. 4-Methylisopropyl ketoneB. 3-Methyl-2-butanoneC. Isopropylmethyl ketoneD. 2-Methyl-3-butanone.
Answer» Correct Answer - B `{:(" O"),(" \|\|"),(overset(1)"C"H_(3)overset("2 ")-C-overset(3)"C"H-overset(4)"C"H_(3)),(" \|"),(" CH"_(3)):}`

Discussion

220.	Which of the following reagents is used to distinguish acetone and acetophenone?A. `NaHSO_(3)`B. Grignard reagentC. `Na_(2)SO_(4)`D. `NH_(4)Cl`.
Answer» Correct Answer - A Acetone forms sodium bisulphate adduct but acetophenone does not. Aromatic ketones do not give addition product with `NaHSO_(3)`.

Discussion

221.	Which of the following would undergo Aldol condensation ?A. B. C. D.
Answer» Correct Answer - A::B::D Compounds containing `alpha`-H atom undergo aldol condensation but compound (C ) containing `alpha`-H atom does not undergo aldol condensation. It undergoes Cannizzaro reaction, because the mobility of `alpha`-H atom is arrested by two sterically hindered methyl groups.

Discussion

222.	Which of the methods are better in the synthesis of the following compounds by Witting reagent ?A. B. C. D.
Answer» Correct Answer - A::D Wittig reaction proceeds by `SN^(2)` mechanism. Thus reactivity of RX in `SN^(2)` reaction is `1^(@)gt2^(@)gt3^(@)RX`. In (a) and (d), `1^(@)` RX is used.

Discussion

223.	Two organic compounds (A) and (B) with molecular formula, `C_(3)H_(6)O`, react with HCN in different manner to produce (C) and (D) respectively. On subsequent hydrolysis of (C) and (D) gives optically active substances (E) and (F). Both (E) and (F) on decarboxylation give propan -1-ol. What are (A),(B) (C),(E)and (F)?
Answer» (A) `CH_(3)CH_(2)CHO,(B)H_(2)C=CH_(2)OH,(C)CH_(3)CH_(2)CH(OH)CN,(D)CH_(3)-CH(CN)CH_(2)OH,` `CH_(3)CH_(2)underset("Opitcally active")overset()(CH(OH))COOH,(F)CH_(3)-underset("Optically active")overset()(CH(COOH))CH_(2)OH`

Discussion

224.	Why are `alpha`-hydrogen atom of aldehydes and ketones acidic in nature?
Answer» This is on account of the reason that the remaining carbonions left after the abstraction of `alpha`-hydrogen atom by the base are resonance stabilised.

Discussion

225.	Oxidation of aldehydes is easier than that of ketones. Explain.
Answer» Oxidation of aldhydes involved the cleaveage of `C-H` bond while that of ketones involves the cleavage of C-C bond which is rather difficult.

Discussion

226.	(a) Write the reagent used in the following : `C_(6)H_(5)COCH_(3)overset(?)rarr C_(6)H_(5)CH_(12)CH_(3)` (b) Arrange the following compounds in increasing order of reactivity towards nucleophilic addition. `CH_(3)CHO, C_(6)H_(5)CHO, HCHO`
Answer» (a) `Zn//Hg` and `HCl`. The reaction is known as Clemmense reduction. (b) The correct order is : `C_(6)H_(5)CHO lt CH_(3)CHO lt HCHO`

Discussion

227.	Give the decreasing order of boiling points of the following: (a).(I) Butanal (II) Butane-1-ol (III)Diethyl ether (IV) Pentane (b) (I) Propan`-2`-ol (II) Propan`-2`-one (III) `2-`Methyl propene
Answer» a. All compounds are of comparable molecular masses (72 to74). (II) is alcohol and forms intermolecular H-bonding, and thus bonding, and thus boiling point of (II) would be highest. (I) is aldehyde and has dipole-dipole interaction, and thus boiling point of (I) would be higher than that of either (III). (IV) is alkane, having only weak van der waals forces. Hence, the decreasing order of boiling points is as follows: `(II)gt(I)gt(III)gt(IV)` b. All compounds are of comparable molecular masses: (I) is alcohol, (II) is ketone, and (III) is alkene. Boiling points of alcoholgtketonegtalkene [as explained in part (a) above]. The decreasing order of boiling point is as follows: `(I)gt(II)gt(III)`

Discussion

228.	The reaction, `RCOCl+"diisobutyl aluminium hydride"overset(194K)rarr` gives :A. RCHOB. `RCH_(2)OH`C. RCOORD. `(RCO)_(2)O`.
Answer» Correct Answer - A Sterically hindered Al-hydride reduces acid chloride to aldehyde stage.

Discussion

229.	The order of reactivity of phenyl magnesium bromide with the following compounds is : (I) (II) (III) .A. III gt II gt IB. II gt I gt IIIC. I gt III gt IID. I gt II gt III.
Answer» Correct Answer - D `CH_(3)CHO(I)gt(CH_(3))_(2)C=O(II)gt(Ph)_(2)C=O(III)`

Discussion

230.	`C_(2) H_(5) CHO and (CH_(3))_(2) CO` can be distingushed by testing withA. Phenyl hydrazineB. HydroxylamineC. Fehling solutionD. Sodium bisulphite.
Answer» Correct Answer - C `C_(6)H_(5)CHO` gives red ppt. with Fehling solution.

Discussion

231.	Acetaldehyde when treated with dilute `NaOH` gives.A. `CH_(3)CH_(2)OH`B. `CH_(3)COOH`C. `{:(CH_(3)-CH-CH_(2)CHO),(" \|"),(" OH"):}`D. `CH_(3)-CH_(3)`
Answer» Correct Answer - C Aldol condensation

Discussion

232.	Formaldehyde when reacted with methyl magnesium bromide givesA. `C_(2)H_(5)OH`B. `CH_(3)COOH`C. HCHOD. `CH_(3)CHO`
Answer» Correct Answer - B HCHO gives `1^(@)` alocohol

Discussion

233.	Aldol condensation will not be observed inA. ChloralB. Phenyl acetaldehydeC. HexanalD. Ethanal.
Answer» Correct Answer - A Chloral `"CCl"_(3)CHO` has no `alpha`-hydrogen atom and hence does not undergo aldol condensation.

Discussion

234.	Which of the following is the industrial method of preparation of acealdehyde?A. `H_(2)C=CH_(2)+H_(2)Ooverset(Pd^(++))rarrCH_(3)CHO`B. `CH_(3)COCHI+H_(2)overset(Pd)underset(BaSO_(4))rarrCH_(3)CHO+CHI`C. `CH_(3)CNoverset(SnCI_(2))underset(HCI)rarrCH_(3)CH=NHoverset(H_(3)O^(+))rarrCH_(3)CHO`D. none of the above
Answer» Correct Answer - A

Discussion

235.	`underset(COONa)overset(CHO)(\|)+NaOHoverset(Delta)rarr"Products(s)"` Identify the products (s) :A. `underset(COONa)overset(CHO)\|`B. `underset(COONa)overset(CH_(2)OH)\|`C. both (a) and (b)D. `underset(COONa)overset(CHO)\|`
Answer» Correct Answer - C `underset(COONa)overset(CHO)(\|)+NaOHrarrunderset(COONa)overset(COONa)(\|)+underset(COONa)overset(CH_(2)OH)(\|)`

Discussion

236.	Which of the following hydrogens is the most acidic ? A. (i)B. (ii)C. (iii)D. (iv)
Answer» Correct Answer - B Hydrogen (ii) will be most acidic beacause it is attached to two electron withdrawing group, i.e., phenyl group and carbonyl group.

Discussion

237.	Among the following, the best and the least `H^(Θ)` ion donor, respectively, are:A. B. C. D.
Answer» Correct Answer - A::C The `bar e`-donating order of (OMe) group: `{:(P-OMe,gt,o-OMe,gt,m-OMe),((I),,(II),,(III)),((underset("net more ED")("+R and -I,")),,(underset("so net less ED than (I)")underset("at orarr-I at p")("+R and -I but -I")),,(underset("net EW")underset("at meta")(Only -I))):}` Decreasing order of `overset(Θ)H` donor: `underset(("Best"))(a)gt(b)gt(d) underset(("Least"))("standard")gt(c )`

Discussion

238.	An acid reats with an isotopically labelled methanol to produceA. methyl acetate having all the labelled oxygenB. water having all the labelled oxygenC. both methyl acetate and water contain isotopic oxygenD. no esterification.
Answer» Correct Answer - A Nucleophilic attack by labelled `("Cl O"^(18))` methanol with produce labelled ester.

Discussion

239.	Among the following, the least and the best `H^(Θ)` ion donor, respectively, are:A. B. C. D.
Answer» Correct Answer - A::B More EDG means more negative charge density on the C of `(C-H)` group and consequentyl more easily the `H^(o+)` ion is lost. Order of EDGs: `Me ("three H.C. structures") gt Et ("two H.C. structures") gt i-Pr ("one H.C. structure") gt Ph ("structure") gt Ph ("standard")` Decreasing order of `H^(Θ)` donor. `underset(("Best"))(b)gt(c )gtunderset(("Least"))((d) gt (a))`

Discussion

240.	Among the following, the least and the best `H^(Θ)` ion donor, respectively, are:A. B. C. D.
Answer» Correct Answer - A::D `(-NO_(2))` has `bar e`-withdrawing effect at o-, m- and p-positions. Less `bar e`-withdrawing will be better `H^(Θ)` donor. EW order of `NO_(2)`: `{:(m-NO_(2),lt,p-NO_(2),lt,o-NO_(2)),((I),,(II),,(III)),(("Only -I at m-"),,(underset("at p-")("-R and -I")),,(underset("than (I) and (II)")underset("so net more EW")underset("-I at orarr-I at p-")("-R and -I, but"))):}` Decreasing order of `overset(Θ)(H)` donor. `underset(("Best"))(d)("standard")gt (c )gt underset(("Least"))(b)gt(a)`

Discussion

241.	Among the following, the best and the least `H^(Θ)` ion donor, respectively, are:A. B. C. D.
Answer» Correct Answer - A::D Dianion is more resonance stabilised than anion. So dianion is better H donor than anion. Moreover, (a) is better `H^(Θ)` donor than (c ), due to statistical factor because (a) has two H atoms which can be lost as H ion. Decreasing order of `H^(Θ)` donor: `underset((Best))(a)gt(c )gtunderset(("Least"))(b)gt(d)` (d)

Discussion

242.	The compound having least solubility in water isA. MethanalB. AcetaldehydeC. AcetoneD. Acetophenone.
Answer» Correct Answer - D Solubility decreases with increase in molecular mass of aldehydes or ketones.

Discussion

243.	In the reaction of `NaBH_(4)` with acrylic aldehydeA. only CHO group is reducedB. only `C=C` bond gets saturatedC. both `-CHO` and `C=C` get reducedD. all the answers are wrong.
Answer» Correct Answer - A Only `-CHO ` group is reduced.

Discussion

244.	Compound (x) in the above reaction is :A. `Ph-overset(O)overset(\|\|)(C)-CH_(3)`B. `Ph-overset(O)overset(\|\|)(C)-H`C. `Ph-CH_(2)-overset(O)overset(\|\|)(C)-H`D. `Ph-CH_(2)-overset(O)overset(\|\|)(C)-CH_(3)`
Answer» Correct Answer - B (b) `Ph-overset(O)overset(\|\|)(C)-H` , Nucleophilic addition take place and then hemiacetal will form which will undergo nucleophilic attack .

Discussion

245.	`Ph-overset(O)overset(\|\|)(C)-CH_(3) overset(NaNO_(2))underset(HCl)(to) (A) underset("heat")overset(AC_(2)O)(to) (B)overset(H_(3)O^(+))(to)(C)` Product (C) of the above reaction is :A. `Ph-CO_(2)H`B. `Ph-overset(O)overset(\|\|)(C)-CO_(2)H`C. `Ph-overset(O)overset(\|\|)(C)-overset(O)overset(\|\|)(C)-H`D. `Ph-overset(O)overset(\|\|)(C)-CH_(2)OH`
Answer» Correct Answer - B (b) `PhCOCH_(3) underset(HCl)overset(NaNO_(2))(to) [PhCOCH_(2)NO] to PhCOCH = NOH overset(Ac_(2)O)underset({:("Dehydrating"),("agent"):})(to)PhCOCNoverset(H^(+)//H_(2)O)(to) PhCOCO_(2)H`

Discussion

246.	How will you distinguish between the following ? `C_(6)H_(5)-CH = CH-COCH_(3)` and `C_(6)H_(5)-CH= CH-COCH_(2)CH_(3)`
Answer» With the help of iodoform test.

Discussion

247.	`CH_(3)CH=CH-COCH_(3)` can be oxidised to `CH_(3)CH=CH-COOH` byA. `MnO_(2)`B. `overset(-)Ocl`C. `MnO_(4)^(-)//overset(-)OH`D. `CrO_(2)Cl_(2)`.
Answer» Correct Answer - B It contains a methyl ketone and can be oxidised to carboxylic acid and haloform by halogen and NaOH.

Discussion

248.	Which of the following reactions cannot be used prepare acetophenone ?A. Benzoyl chloride + `(CH_(3))_(2)Cd`B. Oxidation of ethyl benzene with `CrO_(3)` and `CH_(3)COOH`C. Oxidation of ethyl benzene with `KMnO_(4)//H^(+)`D. Friedel Carft acylation of benzene with `CH_(3)COCl or (CH_(3)CO)_(2)O`.
Answer» Correct Answer - C Oxidation of ethyl benzene with `KMnO_(4)//H^(+)` gives benzoic acid.

Discussion

249.	Which of the following is maximum contributing form of carbonyl group ?A. `gtoverset(-)C-overset(+)O`B. `gtoverset(+)C-overset(-)O`C. `gtC=O`D. `gtCoverset(rarr)=O`.
Answer» Correct Answer - C The structure (C) is neutral and is most stable. It contributes maximum towards resonance.

Discussion

250.	Match the following : Answer the following qeustions by appropriately matching the information given in the three columns of the following table. Columns, 1,2 and 3 containing starting materials, reaction conditions and type of reactions, respectively. The only correct combination in which the reaction proceeds through radical mechanism is :A. (I),(ii),(r)B. (II),(iii),(s)C. (III),(ii),(p)D. (IV),(i),(s)
Answer» Correct Answer - A

Discussion

Explore topic-wise InterviewSolutions in .

Write the name of the catalyst used in Wacker Process.

Propanone to iodoform

Propyne to methyl acetate

Which product do you expect when non-terminal alkynes are subjected to hydroboration-oxidation?

Ethanal to lactic acid

Propanal to propyne

Acetaldehyde to acetone

Formaldehyde to n-butane

Among formaldehyde, acetone and acetaldehyde, the reactivity order isA. `HCHO gt (CH_(3))_(2)CO gtCH_(3)CHO`B. `HCHO gt CH_(3)CHO gt(CH_(3))_(2)CO`C. `(CH_(3))_(2)C=OgtHCHOgtCH_(3)CHO`D. Unpredictable.

Formaldehyde to acetaldehyde

For obtaining ethly methyl ketone from acetyl chloride, which of the following reagents can efficiently be employed?A. One mole of `CH_(3)-Mgl`B. Reaction with HI and PC. `H_(2),Pd//BaSO_(4)`D. One mole of `C_(2)H_(5)MgBr`.

Toluene reacts with chromyl chloride to form :A. Benzoic acidB. BenzeneC. BenzaldehydeD. Benzophenone.

The reagent used for the separation of acetaldehyde from acetophenone isA. `NaHSO_(3)`B. `C_(6)H_(5)NHNH_(2)`C. `NH_(2)OH`D. `NaOH//I_(2)`.

The product of the following reaction are `CH_(3)C=C.CH_(2)CH_(3)=overset((i)O_(3))underset((ii)Hydrolysis)rarr?`A. `CH_(3)COOH + CO_(2)`B. `CH_(3)COOH + HOOC CH_(2)CH_(3)`C. `CH_(3)CHO + CH_(3)CH_(2)CHO`D. `CH_(3)COOH + CH_(3)COCH_(3)`.

For the given reaction, `CH_(3)CHO+CHNrarroverset(H_(3)O^(+))rarr` The products is a :A. mixture of 1:1 enantiomers of acidB. mixture of 1:1 disteromers of acidC. mixture of 1:2 enantiomers of acidD. mixture of 1:1 enantiomers of aldehyde

Tischenko reaction of gives :A. B. C. D.

The product formed are:A. `CH_(3)-overset(O)overset(||)C-CHO`B. OHC-CHOC. `CH_(3)-overset(O)overset(||)C-overset(O)overset(||)C-CH_(3)`D. HCOOH

The `IUPAC` name of `CH_(3)COCH(CH_(3))_(2)` isA. 4-Methylisopropyl ketoneB. 3-Methyl-2-butanoneC. Isopropylmethyl ketoneD. 2-Methyl-3-butanone.

Which of the following reagents is used to distinguish acetone and acetophenone?A. `NaHSO_(3)`B. Grignard reagentC. `Na_(2)SO_(4)`D. `NH_(4)Cl`.

Which of the following would undergo Aldol condensation ?A. B. C. D.

Which of the methods are better in the synthesis of the following compounds by Witting reagent ?A. B. C. D.

Why are `alpha`-hydrogen atom of aldehydes and ketones acidic in nature?

Oxidation of aldehydes is easier than that of ketones. Explain.

(a) Write the reagent used in the following : `C_(6)H_(5)COCH_(3)overset(?)rarr C_(6)H_(5)CH_(12)CH_(3)` (b) Arrange the following compounds in increasing order of reactivity towards nucleophilic addition. `CH_(3)CHO, C_(6)H_(5)CHO, HCHO`

Give the decreasing order of boiling points of the following: (a).(I) Butanal (II) Butane-1-ol (III)Diethyl ether (IV) Pentane (b) (I) Propan`-2`-ol (II) Propan`-2`-one (III) `2-`Methyl propene

The reaction, `RCOCl+"diisobutyl aluminium hydride"overset(194K)rarr` gives :A. RCHOB. `RCH_(2)OH`C. RCOORD. `(RCO)_(2)O`.

The order of reactivity of phenyl magnesium bromide with the following compounds is : (I) (II) (III) .A. III gt II gt IB. II gt I gt IIIC. I gt III gt IID. I gt II gt III.

`C_(2) H_(5) CHO and (CH_(3))_(2) CO` can be distingushed by testing withA. Phenyl hydrazineB. HydroxylamineC. Fehling solutionD. Sodium bisulphite.

Acetaldehyde when treated with dilute `NaOH` gives.A. `CH_(3)CH_(2)OH`B. `CH_(3)COOH`C. `{:(CH_(3)-CH-CH_(2)CHO),(" |"),(" OH"):}`D. `CH_(3)-CH_(3)`

Formaldehyde when reacted with methyl magnesium bromide givesA. `C_(2)H_(5)OH`B. `CH_(3)COOH`C. HCHOD. `CH_(3)CHO`

Aldol condensation will not be observed inA. ChloralB. Phenyl acetaldehydeC. HexanalD. Ethanal.

`underset(COONa)overset(CHO)(|)+NaOHoverset(Delta)rarr"Products(s)"` Identify the products (s) :A. `underset(COONa)overset(CHO)|`B. `underset(COONa)overset(CH_(2)OH)|`C. both (a) and (b)D. `underset(COONa)overset(CHO)|`

Which of the following hydrogens is the most acidic ? A. (i)B. (ii)C. (iii)D. (iv)

Among the following, the best and the least `H^(Θ)` ion donor, respectively, are:A. B. C. D.

An acid reats with an isotopically labelled methanol to produceA. methyl acetate having all the labelled oxygenB. water having all the labelled oxygenC. both methyl acetate and water contain isotopic oxygenD. no esterification.

Among the following, the least and the best `H^(Θ)` ion donor, respectively, are:A. B. C. D.

Among the following, the least and the best `H^(Θ)` ion donor, respectively, are:A. B. C. D.

Among the following, the best and the least `H^(Θ)` ion donor, respectively, are:A. B. C. D.

The compound having least solubility in water isA. MethanalB. AcetaldehydeC. AcetoneD. Acetophenone.

In the reaction of `NaBH_(4)` with acrylic aldehydeA. only CHO group is reducedB. only `C=C` bond gets saturatedC. both `-CHO` and `C=C` get reducedD. all the answers are wrong.

Compound (x) in the above reaction is :A. `Ph-overset(O)overset(||)(C)-CH_(3)`B. `Ph-overset(O)overset(||)(C)-H`C. `Ph-CH_(2)-overset(O)overset(||)(C)-H`D. `Ph-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

How will you distinguish between the following ? `C_(6)H_(5)-CH = CH-COCH_(3)` and `C_(6)H_(5)-CH= CH-COCH_(2)CH_(3)`

`CH_(3)CH=CH-COCH_(3)` can be oxidised to `CH_(3)CH=CH-COOH` byA. `MnO_(2)`B. `overset(-)Ocl`C. `MnO_(4)^(-)//overset(-)OH`D. `CrO_(2)Cl_(2)`.

Which of the following reactions cannot be used prepare acetophenone ?A. Benzoyl chloride + `(CH_(3))_(2)Cd`B. Oxidation of ethyl benzene with `CrO_(3)` and `CH_(3)COOH`C. Oxidation of ethyl benzene with `KMnO_(4)//H^(+)`D. Friedel Carft acylation of benzene with `CH_(3)COCl or (CH_(3)CO)_(2)O`.

Which of the following is maximum contributing form of carbonyl group ?A. `gtoverset(-)C-overset(+)O`B. `gtoverset(+)C-overset(-)O`C. `gtC=O`D. `gtCoverset(rarr)=O`.