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Proper Rotation

Improper Rotation

Use of Point Groups

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Exercises:

Check your understanding with the following examples.

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1. Tetrahedral (CCl₄)

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Does the molecule contain the indicated symmetry element?
Axis	Yes/ No
C₂ :	Yes No
C₃:	Yes No
C₄:	Yes No
C₅:	Yes No
C₆:	Yes No

2. Bromochlorofluoromethane CHBrClF

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Does the molecule contain the indicated symmetry element?
Axis	Yes/ No
C₂:	Yes No
C₃ :	Yes No
C₄:	Yes No
C₅ :	Yes No
C₆ :	Yes No

3. Benzene

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Axis	How many?
Check the indicated symmetry elements Benzene has. C₂ C₃ C₄ C₅ C₆	To say "2C₂, 4C₃ and 5C₄", type "2,4,5". Don't forget the commas and no quotation marks. Start from the lowest axis.

4. Ethane staggered

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Axis	If yes, how many?
Check the indicated symmetry elements Ethane staggered has. C₂ C₃ C₄ C₅ C₆	To say "2C₂, 4C₃ and 5C₆", then type "2,4,5". Don't forget the commas and no quotation marks. Start from the lowest axis.

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