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Amines

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

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

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

Answer

(3) aniline

Solution

In electrolytic reduction, nitrobenzene is reduced stepwise: C6H5NO2 C6H5NO C6H5NHOH C6H5NH2

In weakly acidic medium the reduction goes to completion, so aniline is obtained; in strongly acidic medium, the N-phenylhydroxylamine formed in between rearranges to p-aminophenol (p-hydroxyaniline).

The product in weakly acidic medium is aniline.

Answer: (3)

Keep practising — Amines

Ques. 2AIPMT 2005

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
Ques. 3AIPMT 2004

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]
Ques. 4AIPMT 2003

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5AIPMT 2002

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

  1. CH3CH2CH2NHCOCH3
  2. CH3CH2CH2NH2
  3. CH3CH2CH2CONHCH3
  4. CH3CH2CH2CONHCOCH3
Ques. 6AIPMT 2001

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
Ques. 7AIPMT 2000

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

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

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