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JEE Advanced levelSingle correct optionDifficulty 3 of 3ph157

Treat the F atoms in square planar $XeF X_{4}$ and the O atoms in octahedral $XeO X_{6} X^{4 -}$ as ligands. The total number of distinct ligand-Xe-ligand angles of $9 0^{\circ}$ (counting each pair of ligands once) in the two species together is

A12
B14
C16
D18

Answer: C

In a square plane each of 4 ligands has 2 neighbours at

9 0^{\circ}

, giving

4 \times 2/2 = 4

pairs. In an octahedron each of 6 ligands has 4 cis neighbours, giving

6 \times 4/2 = 12

pairs. Total =

4 + 12 = 16

.

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