The product formed in the first step of the reaction of with excess Mg / Et 2 O Et = C 2 H 5 is

The product formed in the first step of the reaction of with excess $\mathrm{Mg}/{\mathrm{Et}}_2\mathrm{O}\left(\mathrm{Et}={\mathrm{C}}_2{\mathrm{H}}_5\right)$ is

Asked in: JEE Main 2021 (24 Feb Shift 1)

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