Question

Which of the following is the symmetry operation of centre of symmetry?

• A. Rotation
• B. Inversion
• C. Reflection
• D. Both (a) and (b)

Answer 1

The correct option is B Inversion

Scientists J. van't Hoff and C. Le Bel (1874) discovered that a molecule that lacks any element of symmetry shows optical activity.

A symmetry element is a point, plane or a line of reference about which symmetry operations can be done.

Elements of symmetry	Operations
Plane of symmetry	Reflection
Axis of symmtry	Rotation
Centre of symmetry	Inversion
Alternate axis of symmetry	Rotation and reflection

Hence, option (b) is correct.