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Chemistry Question 62 – JEE-MAIN 2025

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Match List - I with List - II. List - IList - II(Separation of)(Separation Technique)(A) Aniline from aniline-water mixture(I) Simple distillation(B) Glycerol from spent-lye in soap industry(II) Fractional distillation(C) Different fractions of crude oil in petroleum(III) Distillation at reduced pressureindustry(D) Chloroform-Aniline mixture(IV) Steam distillation Choose the correct answer from the options given below :

Different physical properties like boiling point, solubility, and thermal stability dictate the choice of separation technique.

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Ninja Strategy•Key Example Recognition

Recognizing that the separation of crude oil into different fractions (C) is a classic and primary application of fractional distillation (II) immediately eliminates three options, leaving only the correct one.

Step 1: Analyze each mixture and its components' properties✦ Active

We need to identify the most suitable separation technique for each given mixture based on the physical properties of its components.

A) Aniline from aniline-water mixture: Aniline is steam volatile and immiscible with water.

B) Glycerol from spent-lye in soap industry: Glycerol has a high boiling point and decomposes at or below its boiling point at atmospheric pressure.

C) Different fractions of crude oil in petroleum industry: Crude oil is a complex mixture of hydrocarbons with different, but often close, boiling points.

D) Chloroform-Aniline mixture: Chloroform (b.p. 61∘C) and Aniline (b.p. 184∘C) are miscible liquids with significantly different boiling points.

Step 2: Match each mixture to the appropriate distillation technique○ Expand

Based on the properties:

(A) Aniline from aniline-water mixture → (IV) Steam distillation (for steam volatile, water-immiscible substances).

(B) Glycerol from spent-lye in soap industry → (III) Distillation at reduced pressure (for high-boiling or thermally unstable substances).

(C) Different fractions of crude oil in petroleum industry → (II) Fractional distillation (for separating liquids with close boiling points).

(D) Chloroform-Aniline mixture → (I) Simple distillation (for miscible liquids with large differences in boiling points).

💡 Teacher's Secret Hint

Remember the specific applications of each distillation type.

Step 3: Combine the matches and select the correct option○ Expand

The correct set of matches is: (A)-(IV), (B)-(III), (C)-(II), (D)-(I).

Comparing this with the given options, option 2 matches this combination.

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