Consider the following reactions,
(P) ${\mathrm{PH}}_3+\mathrm{HI}⟶{\mathrm{PH}}_4^{+}{\mathrm{I}}^{-}$
(Q) ${\mathrm{NH}}_3+\mathrm{HI}⟶{\mathrm{NH}}_4^{+}{\mathrm{I}}^{-}$
(R) ${\mathrm{BF}}_3+\mathrm{LiF}\to {\mathrm{Li}}^4{\mathrm{BF}}_4^{-}$
Select the correct options :

Reaction (P) involves maximum increase in bond angle.

In $\mathrm{Q},\mathrm{H}\stackrel{\wedge }{\mathrm{N}}\mathrm{H}$ in ${\mathrm{NH}}_3$ less than that in ${\mathrm{NH}}_4^{+}$

In $\mathrm{P},\mathrm{H}\stackrel{\wedge }{\mathrm{P}}\mathrm{H}$ in ${\mathrm{PH}}_3$ is less than that in ${\mathrm{PH}}_4^{+}$

Reactions (P),(Q) and (R) involve increase in bond angle.