Hybridisation involves the mixing of orbitals having comparable energhies of same atom. Hybridised orbitals perform efficient overlapping than overlapping by pure s, p or orbitals.
Consider the following compounds and select the incorrect statement from the following :
`NH_(3),PH_(3),H_(2)S,SO_(2),BF_(3),PCl_(3),IF_(7),P_(4),H_(2)`

Options

A. Six molecules out of given compounds involves hybridisation
B. Three molecules are hypervalent compounds
C. Six molecules out of above compounds are non-planar in structure
D. Two molecules out of given compounds involves `(d pi- p pi)` bonding as well as also involves `( p pi- p pi)` bonding

Answer

C

Explanation

(a) Involvement of hybridisation `(NH_(3),SO_(2),SO_(3),BF_(3), PCl_(3),IF_(7))`
(b) Hypervalent compounds `(SO_(2),SO_(3),IF_(7))`
(c ) Non-planar molecules `(NH_(3),PH_(3),PCl_(3),IF_(7),P_(4))`
(d) `SO_(2)` [one(` p pi- p pi`) bond and one `(d pi- p pi)` bond], `SO_(3)` [ one `(p pi-p pi)` bond and two `(d pi - p pi)` bonds]