JEE Main · 2021 · 22 Jul 2021 · Shift 2 · Compounds Containing Nitrogen

In the chemical reactions given above A and B respectively are:

(A) $CH_{3} CH_{2} OH$ and $H_{3} PO_{2}$
(B) $CH_{3} CH_{2} Cl$ and $H_{3} PO_{2}$
(C) $H_{3} PO_{2}$ and $CH_{3} CH_{2} OH$
(D) $H_{3} PO_{2}$ and $CH_{3} CH_{2} Cl$ ✓ Correct

Answer: (D)

Solution

Benzene diazonium chloride warmed with hypophosphorous acid and water is reduced, the diazonium group being replaced by hydrogen, so the major product is benzene. Benzene then carries an ethyl group only through Friedel-Crafts alkylation, which needs an alkyl halide with anhydrous

AlC l_{3}

, and the ethyl group of ethylbenzene comes from chloroethane. So A is

H_{3} P O_{2}

and B is

C H_{3} C H_{2} Cl

JEE Main · 2021 · 22 Jul 2021 · Shift 2 · Single correct option

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