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In which of the following pairs of molecules/ions, the central atoms have sp2 hybridization?

1. NO2− and NH3
2. BF3 and NO2−
3. NH2− and H2O
4. BF3 and NH2−

Correct answer: BF3 and NO2−

Solution

In NO2− and BF3, the central atoms (N in NO2− and B in BF3) have sp2 hybridization due to the presence of three regions of electron density around them.

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