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Answer 1

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Answer 2

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$\huge\sf\star$ Concept

This given reaction is Claison arrangement which is powerful carbon - carbon Bond forming chemical reaction .In the given conditions there is sigmatropic rearrangement of an alkyl phenyl either to an intermediate which quickly tautomeriges to an ortho substituted phenol.

$\sf\huge\implies$ If ortho position is substituted then reaction goes to oara position with retention on configuration..

Mechanism The arornatic Clasen rearrangement is followed by re- aromatization Due to electron shift there is a negative charge at the labelled carbon atom (C) hence this carbon is attached to benzene nucleus