Column I (Conversion) Column II (Conversion can be done by) (P) H2 / Pd / BaSO4 (Q) LiAlH4 (C) R – C ≡ N \overset{}{\rightarrow} R – CH = NH (R) Wolf-Kishner reduction (S) Clemmensen reduction (T) Red P/HI (excess)

Engineering

Chemistry

Reduction

Question

Column I (Conversion)	Column II (Conversion can be done by)
	(P) H₂ / Pd / BaSO₄
	(Q) LiAlH₄
(C) R – C ≡ N $\overset{}{\to}$ R – CH = NH	(R) Wolf-Kishner reduction
	(S) Clemmensen reduction
	(T) Red P/HI (excess)

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This question tests knowledge of carbonyl reduction methods. Each conversion in Column I requires a specific reagent from Column II.

Key concepts:

(P) H $2$ /Pd/BaSO $4$ (Rosenmund catalyst) selectively reduces acid chlorides to aldehydes.
(Q) LiAlH $4$ reduces carboxylic acids to primary alcohols.
(R) Wolf-Kishner reduction (N $2$ H $4$ , KOH) converts carbonyl to methylene group.
(S) Clemmensen reduction (Zn-Hg/HCl) also converts carbonyl to methylene.
(T) Red P/HI reduces carboxylic acids to alkanes.

Final Answer: The correct matches are determined by identifying which reagent performs the specific transformation shown in each row of Column I.