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

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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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