The product formed in the first step of the reaction of

Question:

The product formed in the first step of the reaction of

$\mathrm{Mg} / \mathrm{Et}_{2} \mathrm{O}\left(\mathrm{Et}=\mathrm{C}_{2} \mathrm{H}_{5}\right)$ is :


Correct Option: , 4

Solution:

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