JEE Main 2022 · 26 Jun · Shift 2 · Chemistry Q75

← JEE Main 2022 · 26 Jun · Shift 2

ChemistrySingle correct+4 / -1Question 75 of 90

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

\mathrm{LiAlH_4}

\mathrm{KMnO_4}

MnO

\mathrm{NaBH_4}

Answer and worked solution

Official answer: C

Keyed reagent: MnO. Aromatic acids are reduced to aldehydes in one step by passing their vapour (with formic acid) over MnO at about 573 K. $\mathrm{LiAlH_4}$ goes to the alcohol, $\mathrm{NaBH_4}$ does not reduce acids, and $\mathrm{KMnO_4}$ oxidises.

(C)

Topics:Oxidation and reduction Carboxylic acids

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JEE Main 2022 · 26 Jun · Shift 2, Chemistry question 75