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Isomerism · Question 33

AIPMT 2004MCQMedium📈 Topic in 25% papers+4−1
1

The molecular formula of diphenylmethane, [figure] is C13H12. How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?

  1. 6
  2. 4
  3. 8
  4. 7

Answer

(2) 4

Solution

Diphenylmethane, C6H5-CH2-C6H5, is symmetrical: both rings are equivalent.

Different kinds of H atoms:

(i) the CH2 hydrogens ⇒ C6H5-CHCl-C6H5 (1 isomer)

(ii) ring hydrogens at the ortho, meta and para positions ⇒ o-, m- and p-chloro derivatives (3 isomers)

∴ Total monochloro structural isomers = 1 + 3 = 4

Answer: (2)

AIPMT 2004

Keep practising — Isomerism

2

Which of the following pairs of compounds are enantiomers?

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

In this reaction : CH3CHO + HCN CH3CH(OH)CN HOH CH3CH(OH)COOH an asymmetric centre is generated. The acid obtained would be

  1. D-isomer
  2. L-isomer
  3. 50% D + 50% L-isomer
  4. 20% D + 80% L-isomer
AIPMT 2003
4

Geometrical isomers differ in

  1. position of functional group
  2. position of atoms
  3. spatial arrangement of atoms
  4. length of carbon chain
AIPMT 2002
5

A compound of molecular formula C7H16 shows optical isomerism, compound will be

  1. 2,3-dimethylpentane
  2. 2,2-dimethylbutane
  3. 2-methylhexane
  4. none of these
AIPMT 2001
6

[figure] obtained by chlorination of n-butane will be

  1. meso form
  2. racemic mixture
  3. d-form
  4. l-form
AIPMT 2001
7

2-Butene shows geometrical isomerism due to

  1. restricted rotation about double bond
  2. free rotation about double bond
  3. free rotation about single bond
  4. chiral carbon
AIPMT 2000
8

Dihedral angle in staggered form of ethane is

  1. 0
  2. 120
  3. 60
  4. 180
AIPMT 2000

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