Which Of The Following Molecules Has Three Fold Axis Of Asymmetry?

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Question

Which of the following molecules has three fold axis of asymmetry?

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Solution

Correct option is

A molecule is said to possess a three-fold axis of symmetry if on rotation around this axis through an angle of 360/3, ie, 120^o, gives the same arrangement of atoms. Since NH₃ has a pyramidal geometry, therefore, it has a three fold axis of asymmetry.