NEET 2013 Chemistry question

Which of the following is a polar molecule ?

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

Answer: (2)

Solution

A molecule is polar only if the bond dipoles do not cancel because of its geometry. is trigonal planar and is tetrahedral: symmetrical, so the bond dipoles cancel (). (, two lone pairs opposite each other) is

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Question ID VK-091379