Reaction of Grignard reagent, $\mathrm{C}_2 \mathrm{H}_5 \mathrm{MgBr}$ with $\mathrm{C}_8 \mathrm{H}_8 \mathrm{O}$ followed by hydrolysis gives compound " A " which reacts instantly with Lucas reagent to give compound $\mathrm{B}, \mathrm{C}_{10} \mathrm{H}_{13} \mathrm{Cl}$.
The Compound B is :
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