Which of the following species are hypervalent ?
(1) ClO4− (2) BF3 (3) SO42− (4) CO32−
1,2,3
1,3
3, 4
1,2
In ClO4−,no. of e−at Cl atom =7+7=14e−.In SO42−,No. of e−at ' S ' atom =6+6=12e−
These are more than 8e−, therefore hypervalent.