$DNA$ molecule contains $4$ bases whose structures are shown below. One of the structures is not correct,identify the incorrect base structure.

Given below are two statements $:$
Statement $I: D-(+)-\text{glucose} + D-(-)-\text{fructose} \xrightarrow{-H_2O} \text{sucrose}$
$\text{sucrose} \xrightarrow{\text{Hydrolysis}} D-(+)-\text{glucose} + D-(-)-\text{fructose}$
Statement $II:$ Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements,choose the correct answer from the options given below $:$

Identify $A$ in the following reaction:
$C_6H_{12}O_6 \xrightarrow{\text{dil. } HNO_3} A$

Which one of the following compounds will form an osazone derivative?

Which of the following is a carbohydrate?

Which of the following will not show mutarotation?