In the following reaction, X is optically active.

$\underset{\mathbf{X}}{\mathrm{C}_5 \mathrm{H}_{13}} \mathrm{~N} \xrightarrow[\mathrm{~N}_2]{\mathrm{NaNO}_2 / \mathrm{HCl}} \mathbf{Y}($ Tertiary alcohol $)+$ Other products

Find X and Y. Is y optically active? Write all the intermediate steps.

Give reasons :

In the following reaction sequence :

Identify A, B, C and D. Also write chemical equations for cons version of A to B and A to C.

In the following reaction sequence, M is a transition metal.

Identify the metal M and MCl$$_4$$. Explain the difference in colours of MCl$$_4$$ and A.