Q98 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Physical Chemistry · Chapter: Group Theory · Topic: Symmetry Elements Point Groups · Marks: 2 · Difficulty: Medium

The point group obtained by adding symmetry operation $\sigma_h$ to the point group $\mathrm{C_4}$ is

Answer

Answer (as printed): B

The options are missing from the source scan for this question, so there is nothing here for this letter to point at. The letter is what the book printed.

Explanation

C₄ plus a horizontal mirror plane generates S₄ and i as well; the resulting group is C₄h (order 8).

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