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:

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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.

Chemistry - Aromatic Hydrocarbon Question with Solution | TestHub

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