For the following molecules :
`PCl_(5), BrF_(3), IC l_(2)^(-), XeF_(5)^(-),NO_(3)^(-),XeO_(2)F_(2),PCl_(4)^(+),CH_(3)^(+)`
Calculate the value of `(a+b)/(c )`
a = Number of species having `sp^(3)` d-hybridisation
b= Number of species which are planar
c= Number of species which are non-planar

Answer

3

Explanation

`PCl_(5) to sp^(3)d, " non-planar " " " BrF_(3) to sp^(3)d`, bent, T-shape, planar
`IC l_(2)^(-) to sp^(3)d, "linear, planar" " " XeF_(5)^(-) to sp^(3)d^(3)`, pentagonal planar
`NO_(3)^(-) to sp^(2), " planar " " " XeO_(2)F_(2) to sp^(3)d`, see-saw , non-planar
`PCl_(4)^(+) to sp^(3), "tetrahedral, non-planar" " " CH_(3)^(+) to sp^(2)`, Trigonal planar
a=4,b=5, c=3
so, `(a+b)/( c) =3`