Which one of the following is a polysaccharide?

Benedict's solution provides which of the following ions?

When sugar $X$ is boiled with dilute $H_{2}SO_{4}$ in an alcoholic solution,two isomers $A$ and $B$ are formed. $A$ on oxidation with $HNO_{3}$ yields saccharic acid,whereas $B$ is laevorotatory. The compound $X$ is ....... .

The statement that is $NOT$ correct is

Glucose and fructose form:

The number of chiral carbon atoms present in the open-chain structure of $D-(-)$-fructose is: