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 $\beta$-glycosidic linkages only. Compound ' $X$ ' is ..... .
JEE MAIN 2022, Medium
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