The major product (Q) of the following reacti | vedclass

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(C) The reaction involves the Pinacol-Pinacolone rearrangement of a $1,2-$diol.Step $1$: The reaction of the diketone with $Mg-Hg$ followed by $H_2O$

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(C) The reaction involves the Pinacol-Pinacolone rearrangement of a $1,2-$diol.Step $1$: The reaction of the diketone with $Mg-Hg$ followed by $H_2O$ is a reductive coupling reaction (Pinacol reduction) that converts the diketone into a cyclic $1,2-$diol.Step $2$: The treatment of the resulting $1,2-$diol with $Conc. \ H_2SO_4$ and heat leads to the Pinacol-Pinacolone rearrangement.In this specific case,the starting material is cyclodecane$-1,6-$dione. The reduction produces a bicyclic diol,and the subsequent acid-catalyzed rearrangement results in the formation of a spiro-ketone. The structure corresponds to spiro[$4.5$]decan$-6-$one,which matches option $C$.

The major product $(Q)$ of the following reaction is:

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