The molecular formula of the final product of the following synthetic scheme is

The molecular formula of the final product of the following synthetic scheme is
  1. $\mathrm{C}_9 \mathrm{H}_{12} \mathrm{O}$
  2. $\mathrm{C}_{10} \mathrm{H}_{14} \mathrm{C}$
  3. $\mathrm{C}_{10} \mathrm{H}_{15} \mathrm{~N}$
  4. $\mathrm{C}_9 \mathrm{H}_{10} \mathrm{O}$

Solution

When benzyl iodide reacts with $\mathrm{KCN}, \mathrm{CN}^{-}$ displaces I and form benzyl cyanide.
Grignard reagent will add to nitrile to form imine. Imines can be treated with aqueous acid to give ketone.
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Asked in: JEE-TOPICTESTS-CHEMISTRY

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