Question

) What are various elements of symmetry? Give one example illustrating the presence (3)

of such elements in them.

Answer 1

Hi friend,

Various elements of symmetry are:
1)symmetry plane
2)inversion center
3)Proper axis
4) Improper axis

Example:
"cis-1,2-Dichloroethene"

This structure has two orthogonal planes of symmetry and a C2 axis at their intersection. It is achiral.

Answer 2

Hi friend...

A symmetry element is a line , a plane or a point in or through object about with a rotation or reflection leaves object in a orientation indistinguishable from the original.

Various symmetry of elements are :
# symmetry plane.
# inversion centre.
# proper axis .
# improper axis.

Example : cis-1,2 - Dichloroethene
trans -1,2- Dichloroethene
cis -1,2- Dimethylcyclopropane

Hope it helps ....