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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
In order to get paraldehyde from ethanal which of the following reagents is used ?A. `C_(2)H_(5)OH`B. conc. `H_(2)SO_(4)`C. `H_(2)CrO_(4)`D. Any of the above. |
| Answer» Correct Answer - B | |
| 152. |
Paraldehyde is formeed by the polymerisation of:A. `CH_(3)CHO`B. `HCHO`C. `CH_(3)OH`D. `CH_(3)CH_(2)CHO`. |
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Answer» Correct Answer - A `CH_(3)CHO` when heated with `H_(2)SO_(4)` polymerises to form paraldehyde `(CH_(3)CHO)_(3)`. |
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| 153. |
Which of the following is paraldehyde ?A. `(HCHO)_(n)`B. `(CH_(3)CHO)_(3)`C. `(HCHO)_(3)`D. `(CH_(3)CHO)_(4)`. |
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Answer» Correct Answer - B `(CH_(3)CHO)_(3)` |
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| 154. |
Paraldehyde is a trimer ofA. FormaldehydeB. AcetaldehydeC. BenzaldehydeD. Propionaldehyde. |
| Answer» Correct Answer - B | |
| 155. |
A compound X neither reacts with soidum displacing hydrogen nor with `PCl_(5)` to give HCl X reduces an alkaline solution of Cu (II) salt on gentle warming. The structure of X isA. primary alcoholB. secondary alcoholsC. a ketoneD. an aldehyde |
| Answer» Correct Answer - D | |
| 156. |
Acetone reacts with Grignard Reagent to formA. `3^(@)` AlcoholB. `2^(@)` AlcoholC. EtherD. No reation. |
| Answer» Correct Answer - A | |
| 157. |
Product (A) is :A. B. C. D. |
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Answer» Correct Answer - B (b) Nucleophilic addition then hemiacetal will form , which will again undergo nucleophilic attack . |
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| 158. |
Which is the correct alternate ?A. `overset((A))(CH_(3))CH_(2)NH_(2)" " CH_(3)underset(Br)underset(|)overset((B))(CH)COOH " " overset(R_(1))"Schmidt" overset(R_(2))HVZ`B. `CH_(3)CH_(2)NH_(2) " " CH_(3)CH_(2)COBr " " HVZ " " "Schimdt" `C. `CH_(3)CH_(2)CONH_(2) CH_(3)CH_(2)COBr" " HV" " "Schmidt "`D. None is correct |
| Answer» Correct Answer - A | |
| 159. |
Aldehude with `NH_(2)NH_(2)` formsA. anilineB. hydrazonesC. nitrobenzeneD. none of these |
| Answer» Correct Answer - B | |
| 160. |
The reagent most suitable for converting a primary alcohol into an aldeyde isA. acidified `K_(2)Cr_(2)O_(7)`B. acidified `KMnO_(4)`C. alkaline `KMnO_(4)`D. pyridinium chlorochromate |
| Answer» Correct Answer - D | |
| 161. |
Compound (A) given below can undergo Cannizzaro reaction itself and crossed Cannizzaro reaction with HCHO. It is because of: A. It has three `(-CH_(2)OH)` groups.B. It has an aldehyde group.C. It has non-enolisable `alpha-C`.D. It has a keto group. |
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Answer» Correct Answer - C (A) does not have `alpha-H` atom (non-enolisable). |
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| 162. |
A mixture of calcium acetate and calcium formate on heating givesA. acetoneB. acetaldehydeC. benzaldehydeD. acetophenone |
| Answer» Correct Answer - B | |
| 163. |
When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting comound isA. acetophenoneB. benzaldehydeC. benzophenoneD. Acetaldehyde. |
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Answer» Correct Answer - A Nucleophilic attack by labelled `("Cl O"^(18))` methanol with produce labelled ester. |
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| 164. |
What happens when the following are dry distilled (i) Calcium formate (ii) Calcium acetate and calcium formate (iii) Calcium benzoate? |
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Answer» (i) Formaldehyde (ii) Acetaldehyde (iii) Benzophenone |
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| 165. |
Hexamethylene tetramine is used asA. AnalgesicB. AntipyreticC. Urinary antisepticD. All |
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Answer» Correct Answer - C Urinary antiseptic |
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| 166. |
Which of he following reactions `has//have` equilbrium constant `(k_(C))` greater that one?A. `CH_(3)CHO+ KOH hArrCH_(2)CH-OK+H_(2)O`B. C. D. |
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Answer» Correct Answer - B::C |
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| 167. |
Consider the following reaction to answer the next three question: if B is heated with `Zn(Hg)` in concentrated HCI solution the product formed isA. DanceB. C. D. |
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Answer» Correct Answer - A |
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| 168. |
Consider the following reaction to answer the next three question: The most likely structure of A isA. B. C. D. |
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Answer» Correct Answer - C |
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| 169. |
Draw structure of 4-Chloropentanal. |
| Answer» `overset(5)(C)H_(3)-underset(Cl)underset(|)overset(4)(C)H-overset(3)(C)H_(2)-overset(2)(C)H_(2)-overset(1)(C)HO` | |
| 170. |
Aldehydes and ketone will not form crystalline drivatives withA. sidum bisulphiteB. phenyl hydrazineC. semicarbazide hydrochlorideD. dihydrogen sodium phosphate |
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Answer» Correct Answer - D Dihydrogen sodium phosphate `(NaH_(2)PO_(4))` does not react with aldehydes and ketones because `NaH_(2)PO_(4)` does not have any lone pair of electron on phosphorus atom, so its cannot act as a nucleophile. |
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| 171. |
Reaction by which benzaldehyde cannot be prepared is :A. +Zn/Hg and conc. HCl in presence of Anhyd. `AlCl_(3)`B. +Zn/Hg and conc. HClC. in `CS_(2)` followed by `H_(3)O^(+)`D. in the presence of `Pd-BaSO_(4)` |
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Answer» Correct Answer - B Benzaldehyde cannot be prepared by Clemmensen reduction `therefore` option (B) is not carrect while all other options are correct |
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| 172. |
The above reduction can be best carried out by :A. Clemmensen reductionB. Wolff-Kishner reductionC. `NaBH_(4)`D. None of these |
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Answer» Correct Answer - D (d) Number of carbon decreases. Reduction in basic medium to protect`-OH` group . Hence wolff-kishner reduction . |
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| 173. |
Reduction of `gtC=O` to `CH_(2)` can be carried out withA. Catalytic reductionB. `Na//C_(2)H_(5)OH`C. `NH_(2)NH_(2)//KOH`D. `LiAlH_(4)`. |
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Answer» Correct Answer - C Reduction of `gtC-O` to `CH_(2)` can be carried out with Wolff Kishner reaction. |
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| 174. |
The addition of `HCN` to carbonyl compounds is an example ofA. Nucleophilic substitutionB. Electrophilic additionC. Nucleophilic additionD. Electrophilic substitution |
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Answer» Correct Answer - C Addition of HCN to carbonyl compounds is an example of nucleophilic addition. |
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| 175. |
IUPAC name of aldol isA. `alpha`-HydroxybutanalB. 3-HydroxybutanalC. 3-Hydroxybutan-2-oneD. `beta`-Hydroxypropanal. |
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Answer» Correct Answer - B Aldol is `overset(4)CH_(3)overset(3)CHOHoverset(2)CH_(2)overset(1)CHO.` Its IUPAC name is 3-Hydroxybutanal. |
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| 176. |
`CH_(3)-CH=CHCHOoverset(X)rarrCH_(3)CH=CHCH_(2)OH` In the above reacton, X isA. `H_(2)//Ni`B. `NaBH_(4)`C. `K_(2)Cr_(2)O_(7)//H^(+)`D. both A and B |
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Answer» Correct Answer - B `NaBH_(4)` reduces, `gt CO` to `gt CHOH` but does not reduce`C=C` but excess of `"LiAlH"_(4)` reduces both `-CHO` and `C=C` group. |
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| 177. |
Which of the following will react with water?A. `CHCl_(3)`B. `Cl_(3)C-CHO`C. `"CCl"_(4)`D. `ClCH_(2)CH_(2)Cl`. |
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Answer» Correct Answer - B Chloral `("CCl"_(3)CHO)+H_(2)Orarrunderset("CCl"_(3)CH(OH)_(2))("Chloral hydrate")` |
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| 178. |
Thermal decomposition of acetone givesA. `CH_(2)CO+CH_(4)`B. `CO_(2)+H_(2)O`C. `CH_(3)COOH`D. `CH_(3)CHO+H_(2)`. |
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Answer» Correct Answer - A `CH_(3)-overset(O)overset(||)C-CH_(3)overset(Delta)rarrunderset("Ketone")(CH_(2)=C=C+CH_(4))` |
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| 179. |
Aromatic aldehydes in the presence of cyanide ion as catalyst, are converted to acyloins. This reaction is calledA. Perkin reactionB. Cannizzaro reactionC. Benzoin condensationD. Claisen condensation. |
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Answer» Correct Answer - C `underset("(Aromatic Aldehyde) ")(C_(6)H_(5)-overset(O)overset(||)C-H+H-overset(O)overset(||)C-C_(6)H_(5))overset("KCN(alc.)")rarrunderset(("Acyloin"))(C_(6)H_(5)-overset(OH)overset("| ")"CH"-overset(O)overset(||)C-C_(6)H_(5))` |
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| 180. |
`C_(6)H_(5)CHO+HCNrarrC_(6)H_(5)CH(CN)OH` The product would beA. RacemateB. Optically activeC. A meso compoundD. Mixture of Diasteromers. |
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Answer» Correct Answer - D The reaction involves the synthesis of chiral centre. In the lab., the stereospecificity of reaction cannot be controlled. Hence, we get both the enantiomeric forms and such mixture is called Recemic mixture. |
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| 181. |
Give IUPAC name of AcetoneA. EthanalB. PropanoneC. ButanoneD. Propanal. |
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Answer» Correct Answer - A Propanone |
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| 182. |
Assertion When benzaldgyde `(C_(6)H_(5)CHO)` is treated with concentrated NaOD solution in `D_(2)O` Cannizzaro reaction occur but no C-D(bonds with deuterium ) is formed . Reason Cannizzaro reaction involes hydride transfer mechanism.A. Both assertion and reason are correct and reason is the correct explanation of the assertion.B. Both assertion and reason are correct butn reason in not the correct explanation of assertion.C. Assertion is correct but reasn is incorrect.D. Assertion is incorrect but reason is correct. |
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Answer» Correct Answer - A |
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| 183. |
Write IUPAC name of the compound : `CH_(3)COCH_(2)COCH_(3)`. |
| Answer» Correct Answer - Pentan 2 , 4-dione | |
| 184. |
The number of aldehdes of molecular formula `C_(5)H_(10)O` is :A. 2B. 3C. 5D. 4 |
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Answer» Correct Answer - D (i) `CH_(3)CH_(2)CH_(2)CH_(2)CHO` (ii) `{:(" "CH_(3)),(" |"),(CH_(3)-CH-CH_(2)CHO):}` (iii) `{:(" "CHO),(" |"),(CH_(3)-CHCH_(2)CHO_(3)):}` (iv) `{:(" "CH_(3)),(" |"),(CH_(3)-C-CHO),(" |"),(" "CH_(3)):}` |
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| 185. |
Identify the product y in the following reaction sequence A. PentaneB. CyclobutaneC. CyclopentaneD. Cyclopentanoue. |
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Answer» Correct Answer - C Nucleophilic attack by labelled `( "Cl O"^(18))` methanol with produce labelled ester. |
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| 186. |
Carbonyl compounds can generally be converted to hydrocarbons by :A. `H_(2)//Pt`B. `LiAlH_(4)`C. `N_(2)H_(4)-KOH//Delta`D. `K_(2)Cr_(2)O_(7) - H_(2)SO_(4)` |
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Answer» Correct Answer - C (c) Wolff-Kishner reduction . |
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| 187. |
Which of the following gives iodoform test ?A. `CH_(3)CH_(2)OH`B. `C_(2)H_(5)CHO`C. `(CH_(2)OH)_(2)`D. None of these |
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Answer» Correct Answer - A (a) `CH_(3)-CH_(2)-OHoverset(NaOI)(to)CH_(3)-overset(O)overset(||)(C)-Hoverset(NaOI)(to)H-CO_(2)+ CHI_(3)` |
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| 188. |
`Ph-overset(O)overset(||)(C)-OH overset(SOCl_(2))(to)(A) underset(Pd- BaSO_(4))overset(H_(2))(to) (B)` Product (B) is:A. `Ph-overset(O)overset(||)(C)-H`B. `Ph-CH_(2)-OH`C. `Ph-CH_(2)-Cl`D. `Ph-CH=CH_(2)` |
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Answer» Correct Answer - A (a) `Ph-overset(O)overset(||)(C)-OHoverset(SOCl_(2))underset(S_(N)1)(to) Ph-overset(O)overset(||)(C)-Cloverset(H_(2))underset({:("Pd"-BaSO_(4)) , ("Lindlar catalyst"):})(to)Ph-overset(O)overset(||)(C)-H` |
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| 189. |
Which statement about the aldol condensation is correct ?A. A lewis acid is commonly used as a catalystB. The initial step is probably the formation of a carbanionC. A Lewis base is employed to induce carbocation formationD. The carbon chain is lengthened through the elimination of 1 mole of water |
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Answer» Correct Answer - B (b) Enolate ion formed in first step . |
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| 190. |
Which of following compound is hemiacetal ?A. B. C. D. all of these |
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Answer» Correct Answer - D (d) Hemiacetal `to` presence of alcohol and ether on same carbon . |
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| 191. |
`CH_(3)-overset(O)overset(||)(CH)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-CH_(3) to CH_(3) - overset(OH)overset(|)(CH)-(CH_(2))_(3) - CH_(3)` Above conversion can be achieved by :A. Wolf-Kishner reductionB. Clemmensen reductionC. `LiAIH_(4)`D. `NaBH_(4)` |
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Answer» Correct Answer - A (a) Wolff-Kishner is favourable because alcohol is stable in basic medium . |
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| 192. |
Treatment of `(C_(5)H_(12)O)` with concemtrated sulphuric acid results in the formarion of threee alkenes inn differing yields Also. A forms a yellow precipitate on treatment with `NaOH//12`. A turn colour of acidified dichromate solution to blue green forming a new organic compound B which aslo foms yellows precipitate on treatement with `NaOH//12` The most likely name of A `is //are`A. `3`-methyl-`2`-butanolB. `3`-methylbutanolC. `2`-pentanolD. either `"b"`or `"c"` |
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Answer» Correct Answer - A::C |
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| 193. |
Inn the reaction of excess of `"LiAlH"_(4)` with croton aldehydeA. only CHO group is reducedB. only C=C bond gets saturatedC. both -CHO and C=C bond get reducedD. neither C=O nor C=C bond is reduced. |
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Answer» Correct Answer - C `CH_(3)CH=CHCHOoverset("LiAlH"_(4))underset("excess")rarrCH_(3)CH_(2)CH_(2)CH_(2)OH` |
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| 194. |
A and B in the following reaction are A. B. C. D. |
| Answer» Correct Answer - A | |
| 195. |
The number of adol reaction (s) that occurs in the given transformation is A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - C | |
| 196. |
Which one of the following undergoes reaction with `50%` sodium hydroxide solution to give the corresponding alcohol and acid?A. `CH_(3)CH_(2)CH_(2)CHO`B. `CH_(3)-overset(O)overset(||)C-CH_(3)`C. `C_(6)H_(5)CH_(2)CHO`D. `C_(6)H_(5)CHO` |
| Answer» Correct Answer - D | |
| 197. |
Which of the following does not given iodoform test :A. 2-pentanoneB. ethanolC. ethanalD. 3-pentanone |
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Answer» Correct Answer - D the compounds which contain either `CH_(3)-CO-`group or `CH_(3)-underset(OH)underset(|)(C)H` group give postiive Iodoform test In 2-pentanone, `(CH_(3)CH_(2)CH_(2)COCH_(3)),CH_(3)CHO and C_(2)H_(5)OH`, required groups are present, thus they give iodoform as follows `CH_(3)-COCH_(2)-CH_(2)CH_(3)+3I_(2)+4NaOHtounderset("Iodoform (yellow ppt.)")(CHI_(3))darr+CH_(3)CH_(2)CH_(2)COONa+3NaI+3H_(2)O` `CH_(3)CHO+3I_(2)+4NaOHto underset("Iodoform (Yellow ppt.)")CHI_(3))darr+HCOONa+3NaI+3H_(2)O` `C_(2)H_(5)OHoverset(I_(2))toCH_(3)CHO` `CH_(3)CHO+3I_(2)+4NaOHtounderset("Iodoform")(C HI_(3))darr+HCOONa+3NaI+3H_(2)O` But due to absence of `CH_(3)-underset(OH)underset(|)(C)H` or `CH_(3)-underset(|)(C)=` Group in 3-pentanone, it does not give iodoform `underset("3-pentanone")(CH_(3)-CH_(2)-overset(O)overset(||)(C)-CH_(2))-CH_(3)+I_(2)+NaOHto` No reaction. |
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| 198. |
What is true for acetophenone ?A. It reacts with alkaline `KMnO_(4)` followed by acidic hydrolysis and forms benzoic acidB. It reacts with iodine and NaOH to form triidomethaneC. It is prepared by the reaction of benzene with benzoyl chloride in presence of anhydrous aluminium chlorideD. It does not react with freshly prepared ammoniacal silver nitrate solution. |
| Answer» Correct Answer - B | |
| 199. |
Among the following, the least reactive aldehyde isA. HCHOB. `C_(3)H_(7)CHO`C. `CH_(3)CHO`D. `C_(2)H_(5)CHO`. |
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Answer» Correct Answer - B `CH_(3)CH_(2)CH_(2)CHO` is least reactive due to steric hindernce. |
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| 200. |
Write the following isomer of `C_(5)H_(10)O` which does not have `alpha`-hydrogen. |
| Answer» Correct Answer - `(CH_(3))_(3)CHO` | |