JEE Main 2025 Jan 28 Shift 2, Chemistry Q3: Carbohydrates

JEE Main2025Jan 28, Shift 2Chemistry

Match List-I with List-II

List-I (Saccharides)	List-II (Glycosidic-linkages found)
(A) Sucrose	(I) $α 1 - 4$
(B) Maltose	(II) $α 1 - 4$ and $α 1 - 6$
(C) Lactose	(III) $α 1 - β 2$
(D) Amylopectin	(IV) $β 1 - 4$

Choose the correct answer from the options given below :

Solution

Recalling the linkages in each disaccharide and polysaccharide:

Sucrose: $α, β$ -1,2 glycosidic linkage between $α$ -D-glucose and $β$ -D-fructose, so (A) $\to$ (III).

Maltose: $α$ -1,4 linkage between two $α$ -D-glucose units, so (B) $\to$ (I).

Lactose: $β$ -1,4 linkage between $β$ -D-galactose and glucose, so (C) $\to$ (IV).

Amylopectin: branched polymer with $α$ -1,4 linear linkages and $α$ -1,6 branches, so (D) $\to$ (II).

$∴$ Correct match: (A)-(III), (B)-(I), (C)-(IV), (D)-(II).

Concept behind this question

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