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Amines · Question 50

AIPMT 2006MCQEasy📈 Topic in 25% papers+4−1
1

Which of the following is more basic than aniline?

  1. Benzylamine
  2. Diphenylamine
  3. Triphenylamine
  4. p-Nitroaniline

Answer

(1) Benzylamine

Solution

As per NCERT, in aniline the lone pair on nitrogen is delocalised over the benzene ring by resonance, so it is less available for protonation; aryl amines are weaker bases than ammonia and alkyl amines.

Benzylamine (C6H5CH2NH2): the -CH2- group separates N from the ring, so the lone pair is not delocalised ⇒ it behaves like an alkyl amine (pKb ≈ 4.7), far more basic than aniline (pKb = 9.38).

Diphenylamine and triphenylamine: the lone pair is delocalised over two / three rings ⇒ weaker bases than aniline.

p-Nitroaniline: the electron-withdrawing –NO2 group (−R, −I) further decreases basicity.

∴ Benzylamine is more basic than aniline.

Answer: (1)

AIPMT 2006

Keep practising — Amines

2

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2005
3

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

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

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
5

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
6

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2003
7

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
8

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
9

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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