Column-I		Column-II
A	${\mathrm{NaBH}}_4$	p	Covalent compound
B	${\mathrm{PCl}}_{5\left(\mathrm{s}\right)}$	q	Ionic linkage
C	${\mathrm{PBr}}_{5\left(\mathrm{s}\right)}$	r	${\left[{\mathrm{PCl}}_4\right]}^{+}{\left[{\mathrm{PCl}}_6\right]}^{-}$
D	${\mathrm{P}}_4{\mathrm{O}}_{10}$	s	${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2+6{\mathrm{H}}_2\mathrm{O}$

NaBH₄ is a covalent compound.

Phosphorus pentachloride is PCl₅ and in solid state, PCl₅ exists as $\underset{\mathrm{tetrahedral} }{{\left[{\mathrm{PCl}}_4\right]}^{+}}\underset{\mathrm{octahedral}}{ {\left[{\mathrm{PCl}}_6\right]}^{-}}$.

Although phosphorus pentabromide exists in the vapor phase as PBr₅ molecules but in solid phase, PBr₅ is ionic and exists as [PBr₄]⁺Br⁻.

${\mathrm{P}}_4{\mathrm{O}}_{10}+6\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\to 2{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2+6{\mathrm{H}}_2\mathrm{O}$