An organic compound $\left(\mathrm{A}\right)$ composed of $\mathrm{C}, \mathrm{H}$ and $\mathrm{O}$ gives characteristic colour with ceric ammonium nitrate. Treatement of $\left(\mathrm{A}\right)$ with ${\mathrm{PCl}}_5$ gives $\left(\mathrm{B}\right)$, which reacts with $\mathrm{KCN}$ to form $\left(\mathrm{C}\right)$. The reduction of $\left(\mathrm{C}\right)$ with warm $\mathrm{Na}/{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ produces $\left(\mathrm{D}\right).$ which on heating gives $\left(\mathrm{E}\right)$ with evolution of ammonia. Pyridine is obtained on treatment of $\left(\mathrm{E}\right)$ with nitrobenzene. Give structure of compounds $\left(\mathrm{A}\right)$ to $\left(\mathrm{E}\right)$ with proper reasoning.

The product formed in the reaction?

The reaction,

proceeds by the ___ mechanism.

Consider the following reaction sequence

${\mathrm{CH}}_2={\mathrm{CH}}_2\underset{ \mathrm{cold}}{\stackrel{ \mathrm{dil}. {\mathrm{KMnO}}_4 }{⟶}}\mathrm{A}\underset{ \mathrm{excess} }{\stackrel{{\mathrm{PCl}}_5}{⟶}}\mathrm{B}$

The products $\left(\mathrm{A}\right)$ and $\left(\mathrm{B}\right)$ are, respectively :

Consider the following reaction.

The products formed in the reaction are

Consider the following reaction sequence,

The product $\left(\mathrm{B}\right)$ is-

Propene is allowed to react with $\mathrm{m}$-chloroperoxybenzoic acid. The product $\left(\mathrm{A}\right)$ is then reduced with ${\mathrm{LiAlH}}_4$ in dry ether to give $\left(\mathrm{B}\right).$

${\mathrm{CH}}_3\mathrm{CH}={\mathrm{CH}}_2\stackrel{\mathrm{mCPBA}}{⟶}\mathrm{A}\underset{2·{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{1.{\mathrm{LiAlH}}_4}{\to }}\mathrm{B}$

The structure of the product $\left(\mathrm{B}\right)$ is: