Dinitrogen is a robust compound, but reacts at high altitudes to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is :

Correct structure of $$\gamma$$-methylcyclohexane carbaldehyde is

Compound 'A' undergoes following sequence of reactions to give compound 'B'.

The correct structure and chirality of compound 'B' is

[where Et is $$\left.-\mathrm{C}_{2} \mathrm{H}_{5}\right]$$

Given below are two statements.

Statement I : The compound is optically active.

Statement II : is mirror image of above compound A.

In the light of the above statement, choose the most appropriate answer from the options given below.