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A polysaccharide ‘X’ on boiling with dil. H2SO4 at 393 K under 2-3 atm pressure yields ‘Y’. ‘Y’ on treatment with bromine water gives gluconic acid. ‘X’ contains β-glycosidic linkages only. Compound ‘X’ is (1) starch (2) cellulose (3) amylose (4) amylopectin

1. starch
2. cellulose
3. amylose
4. amylopectin

Correct answer: cellulose

Solution

Cellulose is a polysaccharide composed of β-glycosidic linkages, which upon hydrolysis yields glucose. The fact that 'Y' can be converted to gluconic acid indicates that it is derived from glucose, confirming that 'X' is cellulose.

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