Question

Dihydrogen forms three types of hydrides. $$\underline {\left( {\text{i}} \right)} $$  hydrides are formed by alkali metals and alkaline earth metals. $$\underline {\left( {{\text{ii}}} \right)} $$  hydrides are formed by non-metals and $$\underline {\left( {{\text{iii}}} \right)} $$  hydrides are formed by $$d$$  and $$f$$ - block elements at elevated temperature. Complex metal hydrides such as $$\underline {\left( {{\text{iv}}} \right)} $$  and $$\underline {\left( {\text{v}} \right)} $$  are powerful reducing agents.

	(i)	(ii)	(iii)	(iv)	(v)
(a)	Covalent	Molecular	Saline	$$NaH$$	$$LiH$$
(b)	Molecular	Covalent	Ionic	$$LaAl{H_4}$$	$$Ca{H_2}$$
(c)	Ionic	Covalent	Interstitial	$$LaAl{H_4}$$	$$NaB{H_4}$$
(d)	Covalent	Saline	Interstitial	$$LaAl{H_4}$$	$$NaB{H_4}$$