A polysaccharide ' X ' on boiling with dil $\mathrm{H}_2 \mathrm{SO}_4$ 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:
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