A polysaccharide 'X' on boiling with dil H2SO4 at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with…
Biomolecules · Class 12 · JEE Main Previous Year Question
A polysaccharide 'X' on boiling with dil at under pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains -glycosidic linkages only. Compound 'X' is:
- a
Starch
- b✓
Cellulose
- c
Amylose
- d
Amylopectin
Cellulose
Step 1: Polysaccharide Hydrolysis — Boiling polysaccharide 'X' with acid yields 'Y' (glucose), as confirmed by its oxidation to gluconic acid with bromine water.
Step 2: Linkage Specificity — The question states 'X' contains only -glycosidic linkages. Starch, amylose, and amylopectin all contain -glycosidic linkages.
Step 3: Conclusion — Cellulose is a linear polymer of units joined exclusively by linkages, making it the correct compound.
Common Mistake: Confusing the -linkages in starch with the -linkages in cellulose.
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