Which $L$-sugar on oxidation with $HNO_3$ gives an optically active dibasic acid ($2$ $COOH$ groups)?

Which one is a disaccharide?

$A$ carbohydrate consists of

Given below are two statements:
Statement $I:$ Fructose does not contain an aldehydic group but still reduces Tollen's reagent.
Statement $II:$ In the presence of base,fructose undergoes rearrangement to give glucose.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following phenomena is $NOT$ explained by the open chain structure of glucose?

The artificial sweetener sucralose is $ . . . . .$.