(A) Alkyl chloride reacts with
H2∕Pd−BaSO4 and reduced to alkyl aldehyde. This is known as Rosenmund reduction.
(B) Carboxylic acid reacts with
Cl2∕P in aqueous medium to form 2-chlorocarboxylic acid. This reaction is known as HVZ reaction.
[Hell-Volhard-Zelinsky (HVZ) reaction] (C)
Alkyl amide reacts with
Br2 in presence of
NaOH to give alkyl amine. This reaction is known as Hofmann bromide reaction,
(D) Ketone reacts with
Zn−Hg in presence of conc.
HCl to give alkane. This reaction is known as clemmensen reduction.
Hence, correct match is (A)-2, (B)-4, (C)-1, (D)-3.