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In which of the following molecules the central atom does not have sp3 hybridization?

1. NH4+
2. CH4
3. SF4
4. BF4−

Correct answer: SF4

Solution

In SF4, the central sulfur atom undergoes sp3d hybridization, not sp3, due to the presence of one lone pair and four bonding pairs, resulting in a seesaw geometry.

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