When sugar ' $X$ ' is boiled with dilute $H _{2} SO _{4}$ in alcoholic solution, two isomers ' $A$ ' and ' $B$ ' are formed. $'A'$ on oxidation with $HNO _{3}$ yields saccharic acid where as ' $B$ ' is laevorotatory. The compound ' $X$ ' is ....... .
JEE MAIN 2022, Medium
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