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A polysaccharide ‘X’ on boiling with dil. H 2 SO 4 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

Correct answer: cellulose

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