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Question

The molecule having three folds of axis of symmetry is:

A
NH3
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B
PCl5
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C
SO2
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D
CO2
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Solution

The correct option is D NH3
NH3 has pyramidal shape and thus, possesses three folds axis of symmetry.
In symmetry of NH3, the nitrogen atom remains fixed but the hydrogen atoms can be permuted in 3!=6 different ways. The axis of the molecule is called a C3 axis, since the molecule can be rotated about it into 3 equivalent orientations.

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