Question

How to distinguish between Cnv and Cnh point group

Answer 1

Answer:

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Explanation:

It is an S6 (S2n) axis that is coincident with the C3 axis. An S6 rotation is a combination of a C6 followed by a perpendicular reflection (i.e., a σh).

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Answer 2

The difference between Cnv and Cnh point groups is that Cnv contains $\sigma v$ but Cnh contains $\sigma h$ planes.

• Cnv point groups contain one principal axis of symmetry denoted by Cn. It also contains n number of vertical planes of symmetry or $\sigma v$ which is parallel to the Cn axis. It does not contain n number of C2.
• Cnh point groups contain one principal axis of symmetry denoted by Cn. It also contains one horizontal plane of symmetry or $\sigma h$ which is perpendicular to the Cn axis. It does not contain n number of C2.