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Isomerism

AIPMT 2005MCQMediumNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2005

The chirality of the compound [figure]

  1. R
  2. S
  3. E
  4. Z

Answer

(1) R

Solution

CIP priorities (by atomic number): Br (1) > Cl (2) > CH3 (3) > H (4).

H is on the hashed bond, i.e. it points away from the viewer.

Going Br (top) → Cl (lower right) → CH3 (lower left), the direction is clockwise.

∵ The lowest-priority group is away from the viewer, the observed direction gives the configuration directly.

∴ Configuration = R (E/Z is used only for geometrical isomers).

Answer: (1)

Keep practising — Isomerism

Ques. 2AIPMT 2005

Which one of the following pairs represents stereoisomerism?

  1. Structural isomerism and geometrical isomerism
  2. Optical isomerism and geometrical isomerism
  3. Chain isomerism and rotational isomerism
  4. Linkage isomerism and geometrical isomerism.
Ques. 3AIPMT 2004

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
Ques. 4AIPMT 2003

Which of the following pairs of compounds are enantiomers?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5AIPMT 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. 6AIPMT 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. 7AIPMT 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. 8AIPMT 2001

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

  1. meso form
  2. racemic mixture
  3. d-form
  4. l-form
Ques. 9AIPMT 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. 10AIPMT 2000

Dihedral angle in staggered form of ethane is

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

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