WEB TUTORIAL - Group Theory

[Re2Cl8]2- Worked Example

It may help to follow this tutorial whilst looking at The Flow Diagram to follow the process of arriving at the point group.
water

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Perpendicular C2 axes would be at 90° to the primary axis of rotation (the C4 axis). An example of a molecule with nC2 perpendicular to Cn would be BH3 (the structure of which is shown below). This has 3C2 axes at 90° to the primary C3 axis.

BH3 ZBH3 all

Is there nC2 axes perpendicular to Cn (the principle axis of rotation)?
YES
NO