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Isomerism

AIPMT 2003MCQMediumNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2003

Which of the following pairs of compounds are enantiomers?

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

Answer

(1) [figure]

Solution

Enantiomers are non-superimposable mirror images. In a Fischer projection the mirror image is obtained by interchanging the left and right groups on every carbon.

(1) First: –OH on C-2 right, on C-3 left (chiral, no plane of symmetry). Second: –OH on C-2 left, on C-3 right exact mirror image of the first, and not superimposable enantiomers.

(2), (3), (4): the second compound has both –OH on the same side meso form (plane of symmetry); the first is chiral the pairs are diastereomers.

Answer: (1)

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Ques. 2AIPMT 2003

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
Ques. 3AIPMT 2002

Geometrical isomers differ in

  1. position of functional group
  2. position of atoms
  3. spatial arrangement of atoms
  4. length of carbon chain
Ques. 4AIPMT 2001

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
Ques. 5AIPMT 2001

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

  1. meso form
  2. racemic mixture
  3. d-form
  4. l-form
Ques. 6AIPMT 2000

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
Ques. 7AIPMT 2000

Dihedral angle in staggered form of ethane is

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

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