Q52 / 180 · COMEDK 2023 (Morning Shift) · Chemistry

Figure I and II are

  • A
    identical
  • B
    a pair of optical isomers
  • Correct answer
    C
    a pair of conformers
  • D
    a pair of geometrical isomers

Solution

The given structures represent 3,4-dibromohexane. In structure (I), the molecule is in a specific staggered conformation where the bromine atoms are anti to each other. In structure (II), the molecule is in a different staggered conformation where the bromine atoms are gauche to each other.

Since the two structures represent the same molecule in different rotational states around the C3-C4 single bond, they are conformers (specifically, rotational isomers).

Conformers are stereoisomers that can be interconverted by rotation about a single bond. Therefore, (I) and (II) are a pair of conformers.

Answer: a pair of conformers

Hence, the correct answer is option: 'C'.

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