Question

Which of the following is false for the given molecules :-

• A. Equimolecular mixture of I and II does not show optical activity
• B. II and III have different behaviour towards PPL
• C. II & III are identical
• D. I & II can not be separated by fractional distillation method from their mixture.

Answer 1

Answer: (C)

(1) Equimolar mixture of I and II are racemic mixture (optically inactive due to external compensation).
(2) II and III are enantiomer, so different behaviour towards PPL.
(3) II & III are enantiomer (not identical).
(4) Enantiomer (I and II) have same physical property eg MP, BP, viscosity etc. except rotation of PPL , so they are not separated by fractional distillation.