Question
In which of the following molecules/ions BF3, NO2-, NH2- and H2O, the central atom is sp2 hybridised?
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NO2- and NH2-
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NH2- and H2O
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NO2- and H2O
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BF3 and NO2-
Solution
D.
BF3 and NO2-
For sp2 hybridization, there must be either 3 sigma bonds or two sigma bonds and one lone pair of electrons in the molecules or ions.
In BF3 molecule, a number of sigma bond is 3 ie, sp2 hybridization.
In NO2- molecule, the number of sigma bond is 2 and the number of lone pairs is 2 ie, sp3 hybridization.
In NH2-molecule, the number of sigma bond is 2 and the number of lone pairs is 2 ie, sp3 hybridization.
In H2O molecule, the number of sigma bond is 2 and number of the lone pair are 2 ie, sp3 hybridization.
Thus, in BF3 and NO2- central atom is sp2 hybridised.
