In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?

In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?

Q. In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?

  1. BeF2
  2. BF3
  3. C2H2
  4. NH3

Answer: C2H2

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