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 :
Show Hint
- starch
- cellulose
- amylose
- amylopectin
The Correct Option is B
Solution and Explanation
Starch (amylose and amylopectin) is made of \(\alpha\)-D-glucose units joined by \(\alpha\)-glycosidic linkages (\(\mathrm{C_1{-}C_4}\), and \(\mathrm{C_1{-}C_6}\) at branch points in amylopectin).
Cellulose consists of \(\beta\)-D-glucose units joined by \(\beta\)-\(\mathrm{C_1{-}C_4}\) glycosidic linkages only, and on hydrolysis with dilute acid gives D-glucose.
So X is cellulose.
Answer: (2) cellulose
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