Assertion and reason for Aldehyde and ketone
1. Assertion 2–Methylpropanal undergoes Cannizzaro reaction.
Reason : It has a–hydrogen atom.
(a) A (b) B (c) C (d) D
1. (b)
2. Assertion : Addition reaction of carbonyl compounds with ammonia derivatives is carried out under mildly acidic conditions (pH ~ 5).
Reason : In weakly acidic medium ammonia derivative is also protonated.
(a) A (b) B (c) C (d) D
2. (c)
3. Statement-1: Fehling’s test is given by aldehydic group only.
Statement-2: Aldehydes are more reactive than ketones towards nucleophilic attack.
(a) A (b) B (c) C (d) D
3. (d) a–hydroxy ketone also give Fehling’s test.
4. Statement-1: Enol form of cyclohexane-1,3,5 trione is more stable than its keto form.
Statement-2: In enol form, it contains a benzene ring.
(a) A (b) B (c) C (d) D
4. (a)
5. Assertion : Hydrazones of acetaldehyde are prepared in highly acidic medium.
Reason : In weakly acidic medium the carbonyl group is protonated.
(a) A (b) B (c) C (d) D
5. (d) In highly acidic medium, NH2–NH2 will be protonated to form
which will prevent the condensation reaction.
which will prevent the condensation reaction.
6. Assertion : Formic acid reduces Tollen’s reagent.
Reason : Formic acid has aldehydic group.
(a) A (b) B (c) C (d) D
6. (a)
7. Assertion : Reaction of >C=O group with ammonia derivatives is an example of nucleophilic addition reaction.
Reason : The reaction is very fast when the solution contains high concentration of [H+].
(a) A (b) B (c) C (d) D
7 (c)
8. Assertion : In CROSS CANNIZZARO reaction with formaldehyde, it gets always oxidized.
Reason : Nucleophilic addition reaction is highest in HCHO.
(a) A (b) B (c) C (d) D
.
Reason : NO+ is isoelectronic with N2.
(a) A (b) B (c) C (d) D. (a)
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