Which of the following is not a polysaccharide?

Assertion : Sucrose undergoes mutarotation.
Reason : Sucrose is a disaccharide.

Which of the following reagents converts the $-CHO$ and $-CH_2OH$ groups of glucose to $-COOH$ groups?

In aqueous solution,glucose remains as:

The aqueous solution of a carbohydrate gives a dark blue colour with iodine. It is

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Ketoses give Seliwanoff's test faster than Aldoses.
Reason $(R)$: Ketoses undergo $\beta$-elimination followed by formation of furfural.
In the light of the above statements,choose the correct answer from the options given below: