JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Hydrocarbons

Method used for separation of mixture of products ( B and C ) obtained in the following reaction is:

(A)Simple distillation
(B)sublimation
(C)steam distillation
(D)fractional distillation✓ Correct

Answer: (D)

Solution

Benzene with bromine and the Lewis acid

FeBr X_{3}

undergoes electrophilic substitution to bromobenzene (A). Bromine is ortho/para directing, so nitration of bromobenzene with concentrated

HNO X_{3}

and

H X_{2} SO X_{4}

gives a mixture of 1-bromo-2-nitrobenzene and 1-bromo-4-nitrobenzene (B and C). These two positional isomers have boiling points that differ only slightly, so the mixture is resolved by fractional distillation.

JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Single correct option

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