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JEE Main 2025 Jan 28 Shift 2, Chemistry Q7: Carbohydrates

JEE Main2025Jan 28, Shift 2Chemistry
Q.

Identify correct conversion during acidic hydrolysis from the following :

(A) starch gives galactose.

(B) cane sugar gives equal amount of glucose and fructose.

(C) milk sugar gives glucose and galactose.

(D) amylopectin gives glucose and fructose.

(E) amylose gives only glucose.

Choose the correct answer from the options given below :

  1. A

    (C), (D) and (E) only

  2. B

    (A), (B) and (C) only

  3. C

    (B), (C) and (E) only

  4. D

    (B), (C) and (D) only

Solution

Evaluating each statement against the actual hydrolysis products:

(A) Starch on acid hydrolysis gives only D-glucose, not galactose. Incorrect.

(B) Cane sugar (sucrose) on acid hydrolysis gives equimolar D-glucose and D-fructose (invert sugar). Correct.

(C) Milk sugar (lactose) on acid hydrolysis gives D-glucose and D-galactose. Correct.

(D) Amylopectin is a polymer of -D-glucose only; no fructose is produced. Incorrect.

(E) Amylose is a linear polymer of -D-glucose units and yields only glucose on hydrolysis. Correct.

The correct statements are (B), (C) and (E).

Concept behind this question

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