Which of the following molecules has three-fold axis of symmetry
[UPSEAT 2004]

NH₃

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C₂H₄

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CO₂

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SO₂

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Solution

The correct option is A
NH₃

In NH₃ molecule, the original appearance is repeated as a result of rotation through. Such as axis is said to be an axis of three-fold symmetry or a triad axis.

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[Orrisa JEE 2004]

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