How many isomer of `C_(4)H_(8)O` when reacts with `CH_(3)MgBr` followed by acidification to give `2^(@)` alcohol (only consider carbonyl isomers) ?
(including stereoisomer)

Answer

2

Explanation

(a) `CH_(3)-CH_(2)-CH_(2)CHOunderset((ii)H^(+))overset((i) CH_(3)MgBr)rarr2^(@) "alcohol"`
(b) `CH_(3)-overset(CH_(3))overset(|)(CH)-CHO underset((ii)H^(+))overset((i) CH_(3)MgBr)rarr2^(@) "alcohol"`