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Amines · Question 51

AIPMT 2005MCQMedium📈 Topic in 75% papers+4−1
1

The major organic product formed from the following reaction : [figure] is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(2) [figure]

Solution

Step 1: The amine adds to the carbonyl group (nucleophilic addition) and water is eliminated to give an imine (Schiff base):

(CH3)2CH-CO-CH3 + CH3NH2 -H2O (CH3)2CH-C(CH3)=N-CH3

Step 2: LiAlH4 reduces the C=N bond and hydrolysis (H2O) frees the amine:

(CH3)2CH-C(CH3)=N-CH3 [(iii) H2O](ii) LiAlH4 (CH3)2CH-CH(CH3)-NHCH3

The product is the secondary amine N,3-dimethylbutan-2-amine, in which the carbonyl carbon now carries H and -NHCH3.

Answer: (2)

AIPMT 2005

Keep practising — Amines

2

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

  1. N-phenylhydroxylamine
  2. nitrosobenzene
  3. aniline
  4. p-hydroxyaniline
AIPMT 2005
3

Aniline in a set of reactions yielded a product D. [figure] The structure of the product D would be

  1. C6H5NHOH
  2. C6H5NHCH2CH3
  3. C6H5CH2NH2
  4. C6H5CH2OH
AIPMT 2005
4

In a reaction of aniline a coloured product C was obtained. [figure] The structure of C would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2004
5

The final product C, obtained in this reaction [figure] would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2003
6

CH3CH2Cl NaCN X Ni/H2 Y acetic anhydride Z Z in the above reaction sequence is

  1. CH3CH2CH2NHCOCH3
  2. CH3CH2CH2NH2
  3. CH3CH2CH2CONHCH3
  4. CH3CH2CH2CONHCOCH3
AIPMT 2002
7

Intermediates formed during reaction of [figure] with Br2 and KOH are

  1. RCONHBr and RNCO
  2. RNHCOBr and RNCO
  3. RNH-Br and RCONHBr
  4. RCONBr2
AIPMT 2001
8

A reduction B CHCl3/KOH C reduction N-methylaniline then A is

  1. [figure]
  2. [figure]
  3. CH3NH2
  4. [figure]
AIPMT 2000

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