In which of the following molecules are all the bonds not equal ?

Options

A. `AlF_3 `
B. `NF_3`
C. `ClF_3`
D. `BF_3`

Answer

C

Explanation

`CIF_3`
`H = 1/2 (7 + 3 - 0 + 0) = 5`

`rArr sp^3d` hybridization with 2 lone pairs and T-shaped bond with one lone pair at equatorial position and other lone pair of electrons at axial positions.
So the correct geometry of T-shaped molecule (actually trigonal bipyramidal) is as drawn in this figure :

So the bond lengths are different as
`F - Cl_("axial") gt F - Cl_("equitorial")`