A carbohydrate $(A)$, when treated with dilute HCl in alcoholic solution gives two isomers $(B)$ and $(C)$. $B$ on reaction with bromine water gives a monocarboxylic acid ' $Z$ ' and ' $C$ ' is a ketohexose. What is $A$ ?

Which of the following hormones is an example of polypeptide?

What is the IUPAC name of the product $Y$ in the given reaction sequence?

Two statements are given below :

I. Milk sugar is disaccharide of $\alpha$-D-galactose and $\beta$-D-glucose

II. Sucrose is disaccharide of $\alpha$-D-glucose and $\beta$-D-fructose