A compound (A) reacts with thionylchloride to give a compound (B). (B) reacts with magnesium to form a Grignard reagent which is treated with acetone and the product is hydrolysed to give 2-methyl butan-2-ol. What are the structural formulae of (A) and (B) ?

Explanation

A is ethyl alcohol, Bis ethyl chloride
`CH_(3)underset((A))(CH_(2))OH overset(SOCI_(2)) tounderset((B))(CH_(3)CH_(2)Cl) overset(Mg) toCH_(3)CH_(2)MgCl overset((CH_(3))_(2)C=O)underset(H^(+)//H_(2)O)t oCH_(3)CH_(2)-underset("2-Methylbutane-2ol") underset(CH_(3)) underset(|) overset(OH) overset(|)(C)-CH_(3)`