Question

In which of the following case(s) configuration about chiral carbon is retained?

Answer 1

(a)

Configuration of chiral carbon is retained in this reaction.

(b)


Configuration of chiral carbon is inverted due to $S_{N}2$ reaction.

(c) Two consecutive $S_{N}2$ reaction lead to formation of retained product


(d) Racemization occurs during $S_{N}1$ reaction, so mixture of products having retention and inversion in configuration is obtained.