In which of the following molecules / ions BF _3, NO _2^-, NH _2^- and H _2 O , the central atom is sp^2 hybridized?

NEET 2009 Chemistry question

In which of the following molecules / ions , , and , the central atom is hybridized?

(1) and
(2) and
(3) and Correct
(4) and

Answer: (3)

Solution

Count the electron pairs (bond pairs + lone pairs) around the central atom. : 3 bond pairs, 0 lone pairs, 3 electron pairs, so . : 2 bond pairs (two N-O bonds, with one bond shared) and 1 lone pair

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Question ID VK-090328