The reaction $R-C \equiv C-R \xrightarrow{H_2 / \text{Lindlar's catalyst}}$ gives the major product as ..............

$CH_3-CH_2-CH(Cl)_2$ $\xrightarrow[{[Excess]}]{{NaNH_2}} P$ $\xrightarrow{{CH_3Cl}} Q$,$Q$ will be

The hydrocarbon which can react with sodium in liquid ammonia is

Which of the following gives $H_2$ gas with $Na$?

What is $A$?

The structure of the product $(Z)$ in the reactions given below is:
$HC \equiv CH$ $\xrightarrow{NaNH_2, CH_3COCH_3, H^{+}} X$ $\xrightarrow{Hg^{2+}, H_3O^{+}, H_2O} Z$