JEE Main 2022 · 24 Jun · Shift 1 · Chemistry Q78

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ChemistrySingle correct+4 / -1Question 78 of 90

A polysaccharide 'X' on boiling with dil $\mathrm{H_2SO_4}$ at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains $\beta$ -glycosidic linkages only. Compound 'X' is :

starch

cellulose

amylose

amylopectin

Answer and worked solution

Official answer: B

Hydrolysis. Y is glucose, since bromine water oxidises it to gluconic acid.

Linkage. A glucose polymer with only $\beta$ -glycosidic links is cellulose. Starch, amylose and amylopectin have $\alpha$ links.

(B)

Topics:Carbohydrates

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JEE Main 2022 · 24 Jun · Shift 1, Chemistry question 78