Correct Answer - C
Tertiary alcohols containing at least two identical alkyl grouips may be prepared by the reaction between a Grignard reagent (`2` molecules) and any ester (`1`molecul) other than formic ester:
A secondary alcohol is prepared by interaction of a Grignard reagent (`2`molecules) and formic ester (`1` molecule).
`HCOOCH_(3) underset((2)H_(3)O^(+))overset((1)2CH_(3)MgI,Et_(2)O) rarrCH_(3)CHCH_(3)-overset(OH)overset(|)(C)-CH_(3)`