Which of the following `3^@` alcohols does propyl ester give during reaction with `EtMgBr` ?

Options

A.
B.
C.
D.

Answer

A

Explanation

(a) An ester of the type `(R-overset(O)overset(||)(C)OPr)` reacts with `G.R` to give `3^@` alcohol, with two `R'` groups obtained from `G.R.(EtMgBr) (R = Et-)`. The `3^@` alcohol must contain at least two `(Et-)` groups. `(a)` contains three `(Et-)` groups, two `(Et-)` groups are obtained from `G.R` and one `(Et -)` group is obtained from ester. So, the alcohol is `(a)` and the ester is `(Et-overset(O)overset(||)(C)-O-Pr)` (propyl propanoate).