The number of species having a square planar shape from the following is ____ $\mathrm{XeF}_{4}$, $\mathrm{SF}_{4}$, $\mathrm{SiF}_{4}$, $\mathrm{BF}_{4}^{-}$, $\mathrm{BrF}_{4}^{-}$, $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$, $\left[\mathrm{FeCl}_{4}\right]^{2-}$, $\left[\mathrm{PtCl}_{4}\right]^{2-}$

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Coordination Compounds

The number of species having a square planar shape from the following is ____

XeF_{4}

SF_{4}

SiF_{4}

BF_{4}^{-}

BrF_{4}^{-}

[Cu (NH_{3})_{4}]^{2 +}

[FeCl_{4}]^{2 -}

[PtCl_{4}]^{2 -}

Answer: 4

A square planar shape arises either from an

A X_{4} E_{2}

arrangement, where six electron pairs give four bonds and two lone pairs, or from

d s p^{2}

hybridisation in a coordination complex.

Xe F_{4}

and

Br F_{4}^{-}

each have four bond pairs and two lone pairs and are square planar, while

S F_{4}

is see-saw and

Si F_{4}

and

B F_{4}^{-}

are tetrahedral. Among the complexes,

[Cu (N H_{3})_{4}]^{2 +}

(

d^{9}

) and

[PtC l_{4}]^{2 -}

(

d^{8}

) adopt

d s p^{2}

square planar geometry, whereas

[FeC l_{4}]^{2 -}

(high-spin

d^{6}

) is tetrahedral. The number of square planar species is 4.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Integer answer