Which of the following is the best method for the synthesis of `alpha-`hydroxy butyric acid `(I)` ?
.

Options

A.
B. `MeCH = CH_(2) underset("cold")overset(Br_(2) + H_(2)O)(to) underset(H_(2)O^(o+))overset(KCN)(to)`
C.
D.

Answer

C

Explanation

(a) is `2^@` halide, so with `C overset Ө C N` elimination can also occur.
(b) would give `beta-`hydroxy butyric acid.

Only `( c)` would give the required product :
( c)
(d) It would give butyric acid (step up by one `C` atom).