Which of the following compounds exists a nonresolvable racemic mixture .

Options

A.
B.
C.
D.

Answer

D

Explanation

An amino which has three different groups bonded to nitrogen has chiral nitrogen However such amines cannot be resolved into enantiomers because of rapid inversion of an enantiomer to its mirror image of the given amines only fourth compound has chiral nitrogen atom and thus can exist as a nonresolvable racemic mixture as it loses optical activity due to pyramidal inversion