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Chemical Bonding and Molecular Structure
Question
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In which of the following pairs of molecules/ions, the central atoms have sp2 hybridization?

  • NO2- and NH3

  • BF3 and NO2-

  • NH2- and H2O

  • BF3 and NH2-

Answer

B.

BF3 and NO2-

(i) NO2- ⇒ 2σ + 1 lp =3, ie, sp2 hybridisation
(ii) NH3 ⇒ 3σ + 1 lp = 4, ie, sp3 hybridisation
(iii) BF3 ⇒ 3σ + 0 lp = 3, i.e sp2 hybridisation
(iv) NH2- ⇒ 2σ + 2 lp = 4 i.e sp3 hybridisation
(v) H2O ⇒ 2σ + 2 lp = 4 i.e sp3 hybridisation
Thus, among the given pairs, only BF3 and NO2- have sp2 hybridizations.

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