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(B) The given reaction is an intramolecular aldol condensation of $6$-oxoheptanal. In the presence of a base $(NaOH)$ and heat $(\Delta)$,the enolate

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(B) The given reaction is an intramolecular aldol condensation of $6$-oxoheptanal. In the presence of a base $(NaOH)$ and heat $(\Delta)$,the enolate ion formed at the $\alpha$-carbon of the ketone attacks the carbonyl carbon of the aldehyde. This leads to the formation of a five-membered ring. Subsequent dehydration (loss of $H_2O$) results in the formation of the $\alpha,\beta$-unsaturated carbonyl compound. The major product is $3$-methylcyclopent$-2-$en$-1-$one derivative,which corresponds to option $B$.

The major product obtained in the following reaction is

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