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Which of the following species are hypervalent ?

 (1) ClO4          (2) BF3          (3) SO42            (4) CO32

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a
1,2,3
b
1,3
c
3, 4
d
1,2

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detailed solution

Correct option is B

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.

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