Chemical Bonding And Molecular Structure Ques 100
100. Which of the following molecules is planar?
[1998]
(a) $\mathrm{SF}_4$
(b) $\mathrm{XeF}_4$
(c) $\mathrm{NF}_3$
(d) $\mathrm{SiF}_4$
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Answer:
Correct Answer: 100.(b)
Solution: (b) $\mathrm{XeF}_4$ hybridisation is $=\frac{1}{2}(\mathrm{~V}+\mathrm{X}-\mathrm{C}+\mathrm{A})$
hence $\mathrm{V}=8$ (no. of valence $\mathrm{e}^{-}$)
$X=4$ (no of monovalent atom)
$ \frac{1}{2}(8+4+0-0)=6, s p^3 d^2 $
$\mathrm{C}=0$ charge on cation
$\mathrm{A}=0$ (charge on anion).
BETA
