Which of the following compounds does not undergo Williamson's synthesis?

Identify product ' B ' in following reaction.

$$\mathrm{CH}_3-\mathrm{I}+\mathrm{KCN} \longrightarrow \mathrm{~A} \xrightarrow[\substack{\mathrm{C}_2 \mathrm{H}_2 \mathrm{OH} \\}]{\mathrm{Na}} \mathrm{B} $$

Which of the following is vinylic halide?

Identify the product obtained in the following reaction.

$$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{CH}_3 \mathrm{COOAg} \xrightarrow{\Delta} \mathrm{x}+\mathrm{AgBr}$$