Pure hydrogen is obtained by carrying out the electrolysis of:

Match the correct option from Column-$A$ and Column-$B$.

Column-$A$	Column-$B$
$(1)$ Ionic hydride	$(p)$ $BeH_2$
$(2)$ Interstitial hydride	$(q)$ $TiH$
$(3)$ Electron-precise hydride	$(r)$ $CH_4$
$(4)$ Electron-rich hydride	$(s)$ $H_2O$
	$(t)$ $B_2H_6$

Which among the following is/are primary component$(s)$ of the synthesis gas?

What do you expect the nature of hydrides is,if formed by elements of atomic numbers $15, 19, 23$ and $44$ with dihydrogen? Compare their behaviour towards water.

What is $X$ in the following reaction?
$NaH + B_2H_6 \xrightarrow{\text{Diethyl ether}} X$

Hydrogen readily combines with metals and thus shows its