$2-$Bromobutane $\left(\mathrm{A}\right)$ is treated with $\text{NaI}$ in the presence of dry acetone to give compound $\text{'}\mathrm{B}\text{'}$. The compound $\text{'}\mathrm{B}\text{'}$ is boiled with moist silver oxide to give compound $\text{'}\mathrm{C}\text{'}$. Identify the compounds $\text{'}\mathrm{B}\text{'}$ and $\text{'}\mathrm{C}\text{'}$. How many optical isomers are possible for compound $\text{'}\mathrm{C}\text{'}$?

Identify $\text{'}\mathrm{A}\text{'}$ and $\text{'}\mathrm{B}\text{'}$ in the following reaction:

$\underset{(\mathrm{ii}) {\mathrm{H}}^{\mathrm{+}}/{\mathrm{H}}_{\mathrm{2}}\mathrm{O}}{\overset{(\mathrm{i}) {\mathrm{NaBH}}_{\mathrm{4}}}{\to }}\text{'}\mathrm{X}\text{'}\stackrel{{\mathrm{H}}_{\mathrm{2}}{\mathrm{SO}}_{\mathrm{4}}}{\to }\text{'}\mathrm{Y}\text{'}\stackrel{\mathrm{NaOH}}{\to }\text{'}\mathrm{Z}\text{'}$

The compound $\text{'}\mathrm{Z}\text{'}$ in the above reaction is used as an anionic detergent in soap industry. Give the $\left(\mathrm{i}\right)$ hydrophilic and $\left(\mathrm{ii}\right)$ hydrophobic parts of the compound $\text{'}\mathrm{Z}\text{'}$.

Which one of the following polymers belongs to the class of addition polymers? Which catalyst is used to prepare its monomer from ethanol?

$\left(\mathrm{i}\right) \mathrm{PHBV}$ $\left(\mathrm{ii}\right)$ Nylon$-6$

$\left(\mathrm{iii}\right)$ Polyethene $\left(\mathrm{iv}\right)$ Dextron

In the following set of reactions, the alkyl halide is converted into nitrile and Grignard reagent. Both of these are used to further furnish a carboxylic acid containing one carbon atom more than the starting alkyl halide.

What are the reagents $\mathrm{I}, \mathrm{II} \text{and} \mathrm{III}$ in these reactions?