The unknown (P) of the reaction is | vedclass

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(C) The reaction is a pinacol-pinacolone rearrangement. $1$. Protonation of the more substituted hydroxyl group leads to the formation of a stable $3^

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(C) The reaction is a pinacol-pinacolone rearrangement. $1$. Protonation of the more substituted hydroxyl group leads to the formation of a stable $3^{\circ}$ carbocation at the $C-6$ position. $2$. The cyclopentyl ring undergoes ring expansion to form a more stable $6$-membered ring carbocation. $3$. The oxygen atom on the $C-1$ position donates its lone pair to form a $C=O$ double bond. $4$. Loss of a proton $(H^+)$ yields the final product,which is $2,2$-diphenylcyclohexanone.

The unknown $(P)$ of the reaction is

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