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Isomerism · Question 36

AIPMT 2002MCQEasy📈 Topic in 12% papers+4−1
1

Geometrical isomers differ in

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

Answer

(3) spatial arrangement of atoms

Solution

Geometrical (cis–trans) isomers have the same molecular formula and the same sequence of bonded atoms.

∵ Rotation about the C=C bond is restricted, the groups can be placed on the same side (cis) or on opposite sides (trans).

∴ As per NCERT, they differ only in the spatial arrangement of atoms or groups, i.e. they are stereoisomers.

Answer: (3)

AIPMT 2002

Keep practising — Isomerism

2

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
3

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

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

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
5

Dihedral angle in staggered form of ethane is

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

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