JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Haloalkanes and Haloarenes

In the given reaction 'A' can be

(A)benzyl bromide
(B)bromobenzene✓ Correct
(C)cyclohexyl bromide
(D)methyl bromide

Answer: (B)

Solution

The reaction shows a Wurtz-Fittig coupling where an aryl halide reacts with an alkyl halide in the presence of sodium metal to form an alkyl-substituted benzene. For the product shown (toluene or methylbenzene), compound A must be bromobenzene (

C X_{6} H X_{5} Br

), which couples with methyl bromide (

CH X_{3} Br

) in the presence of sodium to give the methylated aromatic product. Benzyl bromide would give a different product (diphenylethane), and cyclohexyl bromide would not undergo this coupling effectively.

JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Single correct option

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