Which of the following species are not known ?

1.	Which of the following species are not known ?
Answer» `[SiCl_(6)]^(2-)` `[CF_(6)]^(2-)` `[PbCl_(6)]^(2-)` `[SiF_(6)]^(2-)` Solution :Carboncannot expandits covalencybeyond4. Si, however,can have a cooridnationnumber ofbut DUE to sterichindrance of 6 big sized CL ATOMS and weakinteractionbetween lone pairs ofCland `Si`ATOM, `[SiCl_(6)]^(2-)`is not known. Thus, correctoptions are (a) and (b).

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