b Sucrose is a disaccharide. One molecule of sucrose on hydrolysis gives one molecule of glucose and one molecule of fructose.
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Assertion : Treatment of $D-$ glucose with dilute alkali affords an equilibrium mixture consisting of $D-$ mannose, $D-$ fructose and starting substance $D-$ glucose.
Reason : The reaction involves an intermediate in which hybridisation of $C_2$ changes from $sp^3$ to $sp^2$
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 ..... .