JEE Main 2016 Chemistry question

The group of molecules having identical shape is:

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

Answer: (4)

Solution

Count sigma bonds plus lone pairs on the central atom in each case. In option (4): has 3 bonds and 2 lone pairs; has 3 sigma bonds (one to O, two to F) and 2 lone pairs; has 3 bonds and 2 lone pairs. All three have steric number 5, so all are with a trigonal

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Question ID VK-115527