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JEE · NEET Previous Year Question

$Reaction by which benzaldehyde cannot be prepared is$

Topic: JEE PYQ

Answer: D. Full step-by-step solution below.

A $Toluene (i) C r O_{2} C l_{2} in C S_{2} (ii) H_{3} O^{+}$
B $Benzoyl chloride + H_{2} \to Pd - BaSO_{4} Δ$
C $Benzene + CO + HCl \to anhydrous AlCl_{3}$
D $Benzoic acid \to Zn - Hg and conc . HCl$

Correct answer: D

Solution

(d) : Zn - Hg / conc. HCl is used to reduce > C = O to > CH_{2} but it cannot reduce - COOH group.

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