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# Engineering

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

Answers (1)
A Ankit Dutt

As options are not given in the questions, so I am solving this question considering these below options. You can relate to your approach in the same way.

Options:

\\*(a)\, NO_{2}^{-}\, and\, NH_{3}\\*(b)\, BF_{3}\, and\, NO_{2}^{-}\\*(c)\, NH_{2}^{-}\, and\, H_{2}O\\*(d) BF_{3}\, and\, NH_{2}^{-}

NO_{2}^{-}\: =\: 2\,\sigma\,bonds\, and\, 1\, lone\, pair,\, hybridisation\, is\, sp^{2}
NH_{3}\: =\: 3\, \sigma\, bonds,\,and\, 1\, lone\, pair\,, hybridisation\, is\, sp^{3}
BF_{3}^{-}\: =\: 3\,\sigma\,bonds,\, hybridisation\, is\, sp^{3}
NH_{2}^{-}\: =\: 2\,\sigma\,bonds\,and\, 2\, lone\, pairs,\, hybridisation\, is\, sp^{3}
Thus, among the given pairs, only BF_{3}\, and\, NO_{2}^{-} have sp^{3} hybridisation.

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