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Which of the following species are not k...

Which of the following species are not known ?

A

`[SiCl_(6)]^(2-)`

B

`[CF_(6)]^(2-)`

C

`[PbCl_(6)]^(2-)`

D

`[SiF_(6)]^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
A, B
Carbon cannot expand its covalency beyond 4. Si, however, can have a cooridnation number of but due to steric hindrance of 6 big sized Cl atoms and weak interaction between lone pairs of Cl and `Si`atom, `[SiCl_(6)]^(2-)` is not known. Thus, correct options are (a) and (b).
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