Reaction of Grignard reagent, C 2 H 5 MgBr with C 8 H 8 O followed by hydrolysis gives compound A , which reacts instantly with Lucas reagent to give compound B ( C 10 H 13 Cl ) . The Compound B is:

Step-by-step solution

As compound, A instantly reacts with lucas reagent it should be a tertiary alcohol, and A a tertiaryl alcohol is formed by the reaction of grignard reagent, C 2 H 5 MgBr with C 8 H 8 O , C 8 H 8 O should be a ketone and based on the formula it can be identified as a aromatic ketone.