In which of the following molecules / ions BF 3 , NO 2 - , NH 2 - and H 2O , the central atom is sp 2 hybridized ?

1. A. BF 3 and NO 2 -
2. B. NO 2 - and NH 2 -
3. C. NH 2 - and H 2O
4. D. NO 2 - and H 2O

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