Question

In which of the following molecules / ions BF₃, NO₂⁻ , NH₂⁻
and H₂O , the central atom is sp² hybridized ?
(a) NH₂⁻ and H₂O (b) NO₂⁻ and H₂O
(c) BF₃ and NO₂⁻ (d) NO₂⁻ and NH₂⁻

Answer 1

The ions such as BF₃ and NO₂⁻ is sp^2 hybridized.

Correct option is (c).

Explanation:

For sp² -hybridisation, there must be 3 σ bonds or 2 σ bonds along with a lone pair of electrons.

• NO₂⁻ ⇒ 2σ + 1/p = 3 i.e., sp² -hybridisation
• NH₃ ⇒ 3σ + 1/p = 4 i.e., sp³ -hybridisation
• BF₃ ⇒ 3σ + 0/p = 3 i.e., sp² -hybridisation
• NH₂⁻ ⇒ 2σ + 2/p = 4 i.e., sp³ -hybridisation
• H₂O ⇒ 2σ + 2/p = 4 i.e., sp³ -hybridisation

Thus, among the given pairs, only BF₃ and NO₂⁻ have sp² -hybridisation

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