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Chemistry Question 63 – JEE-MAIN 2025

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Match List - I with List - II. List - IList - II(Purification technique)(Mixture of organic compounds)(A) Distillation (simple)(I) Diesel + Petrol(B) Fractional distillation(II) Aniline + Water(C) Distillation under reduced pressure(III) Chloroform + Aniline(D) Steam distillation(IV) Glycerol + Spent-lye Choose the correct answer from the options given below :

Different distillation techniques are chosen based on the properties of the components in a mixture, such as boiling points, miscibility, and thermal stability.

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Ninja Strategy•Key Match Identification

Identify one or two definitive matches first, such as fractional distillation for Diesel+Petrol or reduced pressure for Glycerol, to quickly eliminate incorrect options.

Step 1: Understand Distillation Techniques✦ Active

Simple distillation is used for separating liquids with a large difference in boiling points (typically >25∘C) or a volatile liquid from a non-volatile solute.

Fractional distillation is employed for separating liquids with close boiling points (typically <25∘C).

Distillation under reduced pressure is suitable for liquids that decompose at or below their normal boiling points, as lowering the pressure reduces the boiling point.

Steam distillation is used for purifying liquids that are steam volatile, immiscible with water, and have high boiling points, allowing them to distill below 100∘C.

Step 2: Match Techniques to Mixtures○ Expand

(A) Simple distillation: Chloroform (bp 61∘C) and Aniline (bp 184∘C) have a large boiling point difference and are miscible. Thus, (A) matches (III).

(B) Fractional distillation: Diesel and Petrol are petroleum fractions with close boiling points. Thus, (B) matches (I).

(C) Distillation under reduced pressure: Glycerol (bp 290∘C) decomposes at its normal boiling point. Thus, (C) matches (IV).

(D) Steam distillation: Aniline is steam volatile and immiscible with water. Thus, (D) matches (II).

Step 3: Select the Correct Option○ Expand

The correct matches are (A)-(III), (B)-(I), (C)-(IV), (D)-(II).

Comparing this with the given options, option 2 is the correct choice.

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