. Among the following the pair in which the two species are not isostructural is

(a) SiF4 and SF4

(b) IO3- and XeO3

(c) BH4- and NH4+

(d) PF6- and SF6

Best Answer

Correct Option is: A

Si is from carbon family with 4 valence electron and S is from oxygen family with 6 valence electron. SiF4 has symmetrical tetrahedral shape which is due to hybridisation of the central silicon atom SF4 has distorted tetrahedral or see-saw geometry which arises due to sp3d hybridisation of the central sulphur atom and due to the presence of one lone pair of electrons in one of the equatorial hybrid orbitals.

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