How will you prepare acetylene from iodoform?

For the given reaction:

What is $\mathrm{A}$?

The major product of the following reaction is

Complete and balance the following equation. State the conditions wherever necessary.

${\mathrm{CaC}}_2+{\mathrm{H}}_2\mathrm{O}\to \_\_\_\_\_$

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. Explain the reaction:

${\mathrm{CaC}}_2\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }\mathrm{A}\underset{{\mathrm{HgSO}}_4}{\overset{\mathrm{dil}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\mathrm{B}\stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{\to }\mathrm{C}$

Identify the compound $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$.

$\mathrm{A}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{B}\stackrel{\mathrm{ammoniacal} \mathrm{CuCl}}{\to }\mathrm{C}\stackrel{\mathrm{dil} \mathrm{HCl}}{\to }\mathrm{HC}\equiv \mathrm{CH}$

Name the compound prepared by the following reaction :

${\mathrm{CaC}}_2+2{\mathrm{H}}_2\mathrm{O}\to$