JEE Main Chemistry question

The ease of reduction of C₆H₅COCl (I), C₆H₅CHO (II), C₆H₅COCH₃ (III) and C₆H₅COOC₂H₅ (IV) by hydrogen over a palladium catalyst follows the order

(A)I > II > III > IVCorrect
(B)IV > III > II > I
(C)II > III > I > IV
(D)III > II > I > IV

Answer: (A)

Solution

Ease of catalytic hydrogenation (reduction) of a carbonyl compound correlates with how electrophilic and how reactive the carbonyl carbon is, and with the quality of the leaving group if substitution-type reduction is involved. Acid chlorides (I, best leaving group, Rosenmund-type conditions

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Question ID VK-149506