Which of the following reactions will give identical products?

Explain the following :

$\mathrm{KCN}$ reacts with $\mathrm{R}-\mathrm{I}$ to give alkyl cyanide, while $\mathrm{AgCN}$ results in isocyanide as the major product.

Explain the following :

($\mathrm{i}$) Iodoform gives precipitate with ${\mathrm{AgNO}}_3$ on heating while ${\mathrm{CHCl}}_3$ does not.

Explain the following:

Hydrogen atom of chloroform is definitely acidic, but that of methane is not.

Explain the following:

($\mathrm{i}$)$\text{ A}$ small amount of alcohol is added to chloroform bottles

Explain the following:

${\mathrm{CH}}_3-{\mathrm{CH}}_2\mathrm{I}$ reacts more rapidly with strong base in comparison to ${\mathrm{CD}}_3{\mathrm{CH}}_2$$\mathrm{I}$.