(A)

The compound undergoes an intramolecular aldol condensation reaction in the presence of aqueous NaOH.

Steps Involved :

Abstraction of Proton :

The proton attached to the alpha carbon is abstracted, generating a carbanion.

Nucleophilic Addition :

The carbanion attacks the electropositive carbonyl carbon, forming a cyclic intermediate.

Dehydration :

The cyclic intermediate undergoes dehydration to yield the final product.

Option (A) in Column I matches with (R), (S), and (T) in Column II.

(B)

Nucleophilic Addition :

The ketone reacts with methyl magnesium bromide, forming a secondary alcohol. This is a nucleophilic addition reaction.

Nucleophilic Substitution :

The highly nucleophilic oxygen attacks the C_1 carbon of the alkyl chain from the back, displacing chlorine to form the final product.

Option (B) in Column I matches with (P) and (S) in Column II.

(C)

Nucleophilic Addition :

The compound undergoes a nucleophilic addition reaction in the presence of $\mathrm{H}_2 \mathrm{SO}_4$.

Dehydration :

The molecule loses water, forming an alkene.

Option (C) in Column I matches with (R) and (S) in Column II.

(D)

The compound reacts with sulfuric acid to form a carbocation, which undergoes electrophilic substitution.

Reaction :

Option (D) in Column I matches with (Q) and (R) in Column II.