Which of the following species are hypervalent ? (1) ClO4− (2) BF3 (3) SO42− (4) CO32−

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1,2,3

1,3

3, 4

1,2

answer is B.

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Detailed Solution

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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