970 + Interview Questions in ALCOHOLS IN GENERAL AWARENESS Page 14 InterviewSolution

651.	Hydrogen bonding is maximum in:A. ethanolB. diethyl etherC. ethyl chlorideD. triethylamine.
Answer» Correct Answer - A In ethanol, H atoms is attached with oxygen, where as no hydrogen bonding occurs in diethyl ether, ethyl chloride and triethylamine, because no hydrogen is attached with oxygen or nitrogen.

Discussion

652.	Lucas reagent is used to distinguish among primary, secondary and tertiaryA. alkyl halidesB. alcoholsC. aliphatic aminesD. aromatic amines.
Answer» Correct Answer - B Lucas reagent is the solution of anhydrous `ZnCI_2` in cone. HCI. `1^@` alcohols gives cloudiness not at all at room temperature `2^@` alcohols gives cloudiness within five minutes. `3^@` alcohols gives cloudiness immediately.

Discussion

653.	Ethers are basic in nature owing to the presence ofA. unshared electron pairs on oxygenB. alkyl groupC. turn blue limus redD. all of these
Answer» Correct Answer - A

Discussion

654.	1-butanol is treated with PCC gives,A. `CH_3CH_2CH_2COOH`B. `CH_3CH_2CH_2CHO`C. `CH_3COCH_2CH_3`D. `CH_3COOH`
Answer» Correct Answer - B 1-butanol is treated with alkaline `KMnO_4` undergoes controlled oxidation gives butanal and when it is treated with strong oxidising agent it give directly butanoic acid.

Discussion

655.	Which of the following is maximum basic ?A. `CH_3CH_2-CH_2-CH_2-OH`B. `(CH_3)_2CH-CH_2-OH`C. `CH_3CHOHC_2H_5`D. `(CH_3)_3C-OH`
Answer» Correct Answer - D

Discussion

656.	Which one of the following reaction would produce secondary alcohol?A. `C_(6)H_(6)overset(O)overset(\|\|)"C"CH_(3) overset(CH_(3)Mg Br, H^(+))rarr `B. `C_(6)H_(5)overset(O)overset(\|\|)C CH_(3) overset(LiAlH_(4)H^(+))rarr`C. `CH_(3)CHO overset(LiAlH_(4),H^(+))rarr`D. `CH_(3)overset(O)overset(\|\|)C CH_(3) overset(OH^(Theta),Br_(2))rarr`
Answer» Correct Answer - B `underset("Acetophenone")(C_(6)H_(5)-overset(O)overset(\|\|)C-CH_(3))overset((i)LiAlH_(4))underset((ii)H^(+))rarr underset("alcohol")underset("Secondary")(C_(6)H_(5)-overset(OH)overset("\| ")"CH"-CH_(3))`

Discussion

657.	Which of the following compound would not evolve `CO_(2)` when treated with `NAHCO_(3)` solution ?A. Salicylic acidB. PhenolC. Benzoic acidD. 4-nitrobenzoic acid
Answer» Correct Answer - B Phenol does not decompose sodium carbonate or sodium bicarbonte. i.e., `CO_(2)` is not evolved because phenol is a weaker acid than carbonic acid.

Discussion

658.	An organic compound X reacts with sodium metal and evolve hydrogen gas, on oxidation of X by PCC give aldehyde. The formula of X could beA. `(CH_3)_2CH-OH`B. `CH_3-CH_2-OH`C. `(CH_3)C-OH`D. `CH_3-CHOHC_2H_5`
Answer» Correct Answer - B

Discussion

659.	Which of the following statement about ethers is/are incorrect ? (1) Ethers, are very reactive (2) Ethers are weakly acidic (3) Ethers are Lewis base (4) Ether form stable complex with Lewis acidA. 1, 2, 3B. 1,2C. 2, 3, 4D. 2, 4
Answer» Correct Answer - B

Discussion

660.	`CH_3CH_2CH_2OH` is functional isomer ofA. ethyl methyl etherB. ethyl n-propyl etherC. methyl n-propyl etherD. 2-propanol
Answer» Correct Answer - A

Discussion

661.	Correct order of increasing boiling points isA. propane lt n-butane lt ethanol lt waterB. propane lt ethanol lt n-butane lt waterC. waterlt ethanol lt propane lt n-butaneD. water lt propane lt n-butane lt ethanol
Answer» Correct Answer - A

Discussion

662.	The order of reactivity of fo llowing alcohols towards HCl is, 1.`CH_3OH`, 2.`CH_3CH_2CH_2OH` , 3.`(CH_3)_2CHOH` , 4.`(CH_3)_3COH`A. 1 gt 2gt 3gt 4B. 4 gt 3 gt 2 gt1C. 3 gt 4 gt 2 gt 1D. 2 gt 4 gt 1 gt 3
Answer» Correct Answer - B

Discussion

663.	Tertiary alcohols are resistant to oxidation becauseA. they do not have `alpha`-hydrogen atomB. due to large +I effect of alkyl groupC. due to greater steric hindranceD. all of these
Answer» Correct Answer - A

Discussion

664.	Acrolein is formed when glycerol is heated with `:`A. acidified `KMnO_(4)`B. `Br_(2)` waterC. `KHSO_(4)`D. `HNO_(3)`
Answer» Correct Answer - C

Discussion

665.	When glycerol is treated with a small amount of HI or `PI_(3)`, the product obtained is:A. glyceryl tri-iodideB. propeneC. allyl iodideD. isopropyl iodide
Answer» Correct Answer - C

Discussion

666.	In esterficationA. `3^(@) gt 1^(@) gt 2^(@)`B. `2 ^(@) gt 3^(@) gt 1^(@)`C. `1 ^(@) gt 2^(@) gt 3^(@)`D. none of these
Answer» Correct Answer - C Order of reactivity of different alcohols towards esterfication is `1^@` alcohol `lt 2^@` alcohol `lt 3^@` alcohols due to increased steric hindracne in `2^@ " and " 3^@` aclcohols .

Discussion

667.	Which of the following is most acidic? (a) H2O(b) CH3OH (c) C2H5OH (d) CH3CH2CH2OH
Answer» H₂O is most acidic

Discussion

668.	`CH_3CH_2OH` can be converted into `CH_3CHO` byA. catalytic hydrogenationB. tratment with `LiAlH_4`C. treatment with pyridnium chorochromateD. treatment with `KMnO_4`
Answer» Correct Answer - C Pyridinium chlorochromate `(PCC)` a complex of chromium trioxicde with phyidine and HCl gives good yield of aldehydes and prevents futher oxidation to carboxylic ancids. `CH_3CH_2OH overset("PCC")rarrCH_2CHO`

Discussion

669.	Which of the following will not form ether ?A. `R-X + C_6H_5ONa to`B. `R-X overset(moist Ag_2O)to`C. `R-X + R -O Na to`D. `CH_2N_2 + R -OH overset(HBF_3)to`
Answer» Correct Answer - B

Discussion

670.	Anisole is reacted with cold HI givesA. Benzyl iodide and methanolB. Phenol and methanolC. Iodobenzene and iodomethaneD. Phenol and iodomethane
Answer» Correct Answer - D

Discussion

671.	Which of the following is an unsymmetrical ether?A. `CH_3-O-C_3H_7`B. `CH_3-O-CH_3`C. `C_2H_5-O-C_2H_5`D. All of these
Answer» Correct Answer - A

Discussion

672.	Which of the following is a simple ether ?A. `CH_3OC_2H_5`B. `C_2H_5-OC_2H_5`C. `C_2H_5OC_3H_7`D. `CH_3CH_2OCH(CH_3)_2`
Answer» Correct Answer - B

Discussion

673.	Methyl acetate is formed from methyl alcohol and what?A. Acetic acidB. Acetic unhydrideC. Acetyl chlorideD. All of these
Answer» Correct Answer - D

Discussion

674.	The monovalent RO group is calledA. alkyl groupB. alkoxy groupC. alkenyl groupD. all of these
Answer» Correct Answer - B

Discussion

675.	The number of metameric ethers possible with the formula `C_(4)H_(10)O` areA. 4B. 3C. 2D. 5
Answer» Correct Answer - B

Discussion

676.

State physical properties of ethers.

Answer»

(1) Dimethyl ether and ethyl methyl ether are gases. Other ethers are colourless liquids with pleasant odour.

(2) Lower ethers are highly volatile and highly inflammable substances.

(3) Boiling points of ethers show gradual increase with the increase in molecular mass.

Ether	B.P/K
CH₃ - O - CH₃	248
C₂H - O - CH₃	284
C₂H₅ - O - C₂H₅	308

(4) The solubility/miscibility of ethers in water is similar to that of alcohols of comparable molecular mass.

Discussion

677.	Reaction between sodium ethoxide and bromoethane formsA. ethyl methyl etherB. diethyl etherC. dimethyl etherD. acetic acid
Answer» Correct Answer - B `C_2H_5ONa + C_2H_5Br overset(Delta)to C_2H_5OC_2H_5 + NaBr `

Discussion

678.	Which of the following reaction does not from either ?A. RX+ aq. KOHB. RX+ RONaC. `CH_2N_2` + ROHD. ROH + `H_2SO_4` at 413 K
Answer» Correct Answer - A `RX+aq. KOH oversetDelta to ROH + KX ` `RX + RONa overset(Delta)to ROR + NaX` `CH_2N_2+ROH overset(Delta)to ROCH_3 + N_2` `2ROH + H_2SO_4 overset"413 K"to ROR + H_2SO_4 + H_2O`

Discussion

679.	The reaction of `CH_3CH_2Br` and `(CH_3)_3CONa` to form ether is calledA. Williamson reactionB. Wurtz reactionC. Cannizzaros reactionD. Hoffmans reaction
Answer» Correct Answer - A `CH_3CH_2Br + (CH_3)_3CONa oversetDeltato CH_3CH_2OC(CH_3)_3+NaBr`

Discussion

680.	The compounds `CH_3-O-C_3H_7` and `C_2H_5-O-C_2H_5` exhibitA. metamerismB. chain isomerismC. optical isomerismD. cis-trans isomerism
Answer» Correct Answer - A We know that metamerism is a type of isomerism exhibited by members of the same homologous series due to the difference in the nature of alkyl groups such as attached to the polyvalent atom of the functional group .

Discussion

681.	In `CH_(3)CH_(2)OH,` the bond that undergoes heterolytic cleavage most readily isA. `C - C`B. `O - H`C. `C - H`D. `C - O`
Answer» Correct Answer - B

Discussion

682.	In `CH_(3)CH_(2)OH,` the bond that undergoes heterolytic cleavage most readily isA. `C-N`B. `C-O`C. `C-H`D. `O-H`
Answer» Correct Answer - D Reaction of alcohol with `Na` indicates that `(O-H)` bond is most readily broken `(2ROH +2Na rarr 2RONa +H_(2))`

Discussion

683.	Phenol is treated with bromine water and shaken well. The white precipitate of which of the is formedA. m-bromophenolB. 2-4 dibromophenolC. 2, 4, 6-tribromophenolD. a mixture of o- and p-bromophenols
Answer» Correct Answer - C

Discussion

684.	Dehydration is most easy forA. primary alcoholsB. tertiary alcoholsC. secondary alcoholsD. ethanol
Answer» Correct Answer - B

Discussion

685.	Ether `underset(H_2O)overset(dil. H_2SO_4)to ` two products . One of the product on oxidation give acetic acid , while the other on oxidation give acetone . The ether isA. ethyl n-propyl etherB. ethyl methyl etherC. ethyl isopropyl etherD. methyl isopropyl ether
Answer» Correct Answer - C

Discussion

686.	Find out process involved in the following reaction, R-O-R+`H_2O underset"under press"overset(dil. H_2SO_4, Delta)to ` ROH + ROHA. hydrolysisB. oxidationC. hydrationD. reduction
Answer» Correct Answer - A

Discussion

687.	Tonics, generally contains,A. etherB. methanolC. ethanolD. rectified spirit
Answer» Correct Answer - C

Discussion

688.	The reaction `CH_3CH_2OH underset"453 K"overset(95% H_2SO_4)to CH_2=CH_2+H_2O` is an example ofA. dehydrationB. dehydrogenationC. hydrationD. decarboxylation
Answer» Correct Answer - A

Discussion

689.	Give IUPAC name of the compund given below: `CH_3-underset(Cl)underset(\|)CH-CH_2-CH_2-underset(OH)underset(\|)CH-CH_3`A. 2-Chloro-5-hydroxyhexaneB. 2-Hydroxy-5-chlorohexaneC. 5-Chlorohexan-2-olD. Chlorohexan-5-ol
Answer» Correct Answer - C

Discussion

690.	In the sequence of reaction . `CH_3-CH_2-CH=CH_2 underset((ii)H_2O_2//NaOH)overset((i)B_2H_6//THF)to A overset("conc." H_2SO_4)to B overset(H_3O^+)to C` In above reaction A and C are respectivelyA. B. C. D.
Answer» Correct Answer - A

Discussion

691.	Compound (A), `C_(10)H_(12)O` gives off hydrogen on treatment with sodium metal and decolourises `Br_(2)` in `C Cl_(4)` to give (B), `C_(10)H_(12)OBr`. (A) on treatment with `I_(2)` in `NaOH` gives iodoform and an acid (C) after acidification. Give the structure of (A) to (C) and also of all geometrical and optical isomers of (A). Answer the following based on the above. Which of the following statements regarding A are incorrect ?A. In the presence of acidic medium Aforms a 5 membred ring.B. A has 2 geometrical isomers.C. A has 4 pairs of diasteereomersD. A has 2 chiral centres
Answer» Correct Answer - D

Discussion

692.	Glycol on treatment with `PI_(3)` mainly givesA. EhtyleneB. Ethylene iodideC. Ethyl iodideD. Ethane
Answer» Correct Answer - A

Discussion

693.	Ethers are isomeric withA. AldehydesB. AcidsC. AlcoholsD. Ketones
Answer» Correct Answer - C

Discussion

694.	Which of the following types of ethers cannot be sythesized by Williamson synthesis ?A. `H_(3)C-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-O-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-CH_(3)`B. `H_(3)C-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-O-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-H`C. `C_(6)H_(5)-O-C_(6)H_(5)`D. None of these
Answer» Correct Answer - D

Discussion

695.	The number of moles of `HIO_(3)` formed during periodic oxidation of cyclohexa (1,2,3) triol____
Answer» Correct Answer - 2

Discussion

696.	Which of the following does not react with diethyl etherA. `C_(2)H_(5)Ona`B. `A1C1_(3)`C. `BF_(3)`D. `HC1`
Answer» Correct Answer - A

Discussion

697.	`A+B rarr CH_(3)-O-C(CH_(3))_(3) overset(HI)rarrX+Y` Correct statement among the following isA. A and B are `CH_(3)Ona` and `(CH_(3))_(3)` CBrB. X and Y are `CH_(3)` I and `(CH_(3))_(3)` COHC. X and Y are `CH_(3)` OH and `(CH_(3))_(3)` CID. A and B are `CH_(3)`OH and `(CH_(3))_(3)` COH
Answer» Correct Answer - C

Discussion

698.	Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary alcohols Reason: The reaction leads to a mixture of products.A. Assertion is true, Reason is true, Reason is a correct explanation for AssertionB. Assertion is true, Reason is true, Reason is not a correct explanation for AssertionC. Assertion is true, Reason is falseD. Assertion is false, Reason is true
Answer» Correct Answer - A

Discussion

699.	`C-O-C` bond in ethers can be cleaved byA. `KMnO_(4)`B. `LiAlH_(4)`C. KOHD. HI
Answer» Correct Answer - D

Discussion

700.	Which are not cleaved by `HIO_(4)`? (I) Glycerol (II) glycol (III) 1, 3-propenediol (IV) methoxy-2-propanolA. I, II, III, IVB. I, IIC. II, IIID. III, IV
Answer» Correct Answer - D

Discussion

Explore topic-wise InterviewSolutions in .

Hydrogen bonding is maximum in:A. ethanolB. diethyl etherC. ethyl chlorideD. triethylamine.

Lucas reagent is used to distinguish among primary, secondary and tertiaryA. alkyl halidesB. alcoholsC. aliphatic aminesD. aromatic amines.

Ethers are basic in nature owing to the presence ofA. unshared electron pairs on oxygenB. alkyl groupC. turn blue limus redD. all of these

1-butanol is treated with PCC gives,A. `CH_3CH_2CH_2COOH`B. `CH_3CH_2CH_2CHO`C. `CH_3COCH_2CH_3`D. `CH_3COOH`

Which of the following is maximum basic ?A. `CH_3CH_2-CH_2-CH_2-OH`B. `(CH_3)_2CH-CH_2-OH`C. `CH_3CHOHC_2H_5`D. `(CH_3)_3C-OH`

Which of the following compound would not evolve `CO_(2)` when treated with `NAHCO_(3)` solution ?A. Salicylic acidB. PhenolC. Benzoic acidD. 4-nitrobenzoic acid

An organic compound X reacts with sodium metal and evolve hydrogen gas, on oxidation of X by PCC give aldehyde. The formula of X could beA. `(CH_3)_2CH-OH`B. `CH_3-CH_2-OH`C. `(CH_3)C-OH`D. `CH_3-CHOHC_2H_5`

Which of the following statement about ethers is/are incorrect ? (1) Ethers, are very reactive (2) Ethers are weakly acidic (3) Ethers are Lewis base (4) Ether form stable complex with Lewis acidA. 1, 2, 3B. 1,2C. 2, 3, 4D. 2, 4

`CH_3CH_2CH_2OH` is functional isomer ofA. ethyl methyl etherB. ethyl n-propyl etherC. methyl n-propyl etherD. 2-propanol

Correct order of increasing boiling points isA. propane lt n-butane lt ethanol lt waterB. propane lt ethanol lt n-butane lt waterC. waterlt ethanol lt propane lt n-butaneD. water lt propane lt n-butane lt ethanol

The order of reactivity of fo llowing alcohols towards HCl is, 1.`CH_3OH`, 2.`CH_3CH_2CH_2OH` , 3.`(CH_3)_2CHOH` , 4.`(CH_3)_3COH`A. 1 gt 2gt 3gt 4B. 4 gt 3 gt 2 gt1C. 3 gt 4 gt 2 gt 1D. 2 gt 4 gt 1 gt 3

Tertiary alcohols are resistant to oxidation becauseA. they do not have `alpha`-hydrogen atomB. due to large +I effect of alkyl groupC. due to greater steric hindranceD. all of these

Acrolein is formed when glycerol is heated with `:`A. acidified `KMnO_(4)`B. `Br_(2)` waterC. `KHSO_(4)`D. `HNO_(3)`

When glycerol is treated with a small amount of HI or `PI_(3)`, the product obtained is:A. glyceryl tri-iodideB. propeneC. allyl iodideD. isopropyl iodide

In esterficationA. `3^(@) gt 1^(@) gt 2^(@)`B. `2 ^(@) gt 3^(@) gt 1^(@)`C. `1 ^(@) gt 2^(@) gt 3^(@)`D. none of these

Which of the following is most acidic? (a) H2O(b) CH3OH (c) C2H5OH (d) CH3CH2CH2OH

`CH_3CH_2OH` can be converted into `CH_3CHO` byA. catalytic hydrogenationB. tratment with `LiAlH_4`C. treatment with pyridnium chorochromateD. treatment with `KMnO_4`

Which of the following will not form ether ?A. `R-X + C_6H_5ONa to`B. `R-X overset(moist Ag_2O)to`C. `R-X + R -O Na to`D. `CH_2N_2 + R -OH overset(HBF_3)to`

Anisole is reacted with cold HI givesA. Benzyl iodide and methanolB. Phenol and methanolC. Iodobenzene and iodomethaneD. Phenol and iodomethane

Which of the following is an unsymmetrical ether?A. `CH_3-O-C_3H_7`B. `CH_3-O-CH_3`C. `C_2H_5-O-C_2H_5`D. All of these

Which of the following is a simple ether ?A. `CH_3OC_2H_5`B. `C_2H_5-OC_2H_5`C. `C_2H_5OC_3H_7`D. `CH_3CH_2OCH(CH_3)_2`

Methyl acetate is formed from methyl alcohol and what?A. Acetic acidB. Acetic unhydrideC. Acetyl chlorideD. All of these

The monovalent RO group is calledA. alkyl groupB. alkoxy groupC. alkenyl groupD. all of these

The number of metameric ethers possible with the formula `C_(4)H_(10)O` areA. 4B. 3C. 2D. 5

State physical properties of ethers.

Reaction between sodium ethoxide and bromoethane formsA. ethyl methyl etherB. diethyl etherC. dimethyl etherD. acetic acid

Which of the following reaction does not from either ?A. RX+ aq. KOHB. RX+ RONaC. `CH_2N_2` + ROHD. ROH + `H_2SO_4` at 413 K

The reaction of `CH_3CH_2Br` and `(CH_3)_3CONa` to form ether is calledA. Williamson reactionB. Wurtz reactionC. Cannizzaros reactionD. Hoffmans reaction

The compounds `CH_3-O-C_3H_7` and `C_2H_5-O-C_2H_5` exhibitA. metamerismB. chain isomerismC. optical isomerismD. cis-trans isomerism

In `CH_(3)CH_(2)OH,` the bond that undergoes heterolytic cleavage most readily isA. `C - C`B. `O - H`C. `C - H`D. `C - O`

In `CH_(3)CH_(2)OH,` the bond that undergoes heterolytic cleavage most readily isA. `C-N`B. `C-O`C. `C-H`D. `O-H`

Phenol is treated with bromine water and shaken well. The white precipitate of which of the is formedA. m-bromophenolB. 2-4 dibromophenolC. 2, 4, 6-tribromophenolD. a mixture of o- and p-bromophenols

Dehydration is most easy forA. primary alcoholsB. tertiary alcoholsC. secondary alcoholsD. ethanol

Ether `underset(H_2O)overset(dil. H_2SO_4)to ` two products . One of the product on oxidation give acetic acid , while the other on oxidation give acetone . The ether isA. ethyl n-propyl etherB. ethyl methyl etherC. ethyl isopropyl etherD. methyl isopropyl ether

Find out process involved in the following reaction, R-O-R+`H_2O underset"under press"overset(dil. H_2SO_4, Delta)to ` ROH + ROHA. hydrolysisB. oxidationC. hydrationD. reduction

Tonics, generally contains,A. etherB. methanolC. ethanolD. rectified spirit

The reaction `CH_3CH_2OH underset"453 K"overset(95% H_2SO_4)to CH_2=CH_2+H_2O` is an example ofA. dehydrationB. dehydrogenationC. hydrationD. decarboxylation

Give IUPAC name of the compund given below: `CH_3-underset(Cl)underset(|)CH-CH_2-CH_2-underset(OH)underset(|)CH-CH_3`A. 2-Chloro-5-hydroxyhexaneB. 2-Hydroxy-5-chlorohexaneC. 5-Chlorohexan-2-olD. Chlorohexan-5-ol

In the sequence of reaction . `CH_3-CH_2-CH=CH_2 underset((ii)H_2O_2//NaOH)overset((i)B_2H_6//THF)to A overset("conc." H_2SO_4)to B overset(H_3O^+)to C` In above reaction A and C are respectivelyA. B. C. D.

Glycol on treatment with `PI_(3)` mainly givesA. EhtyleneB. Ethylene iodideC. Ethyl iodideD. Ethane

Ethers are isomeric withA. AldehydesB. AcidsC. AlcoholsD. Ketones

The number of moles of `HIO_(3)` formed during periodic oxidation of cyclohexa (1,2,3) triol____

Which of the following does not react with diethyl etherA. `C_(2)H_(5)Ona`B. `A1C1_(3)`C. `BF_(3)`D. `HC1`

`A+B rarr CH_(3)-O-C(CH_(3))_(3) overset(HI)rarrX+Y` Correct statement among the following isA. A and B are `CH_(3)Ona` and `(CH_(3))_(3)` CBrB. X and Y are `CH_(3)` I and `(CH_(3))_(3)` COHC. X and Y are `CH_(3)` OH and `(CH_(3))_(3)` CID. A and B are `CH_(3)`OH and `(CH_(3))_(3)` COH

`C-O-C` bond in ethers can be cleaved byA. `KMnO_(4)`B. `LiAlH_(4)`C. KOHD. HI

Which are not cleaved by `HIO_(4)`? (I) Glycerol (II) glycol (III) 1, 3-propenediol (IV) methoxy-2-propanolA. I, II, III, IVB. I, IIC. II, IIID. III, IV