Example 1 : Methene : It has no center of Symmetry but has plane of symmetry hence optically inactive.

Example 2 : Ethene : It has both center of Symmetry but has plane of symmetry hence optically inactive.

Example 3 : Ethane: It has center of symmetry as well as plane of symmetry hence optically inactive.

Example 4 : Butadiene : It has center of Symmetry as well as plane of symmetry hence optically inactive.

Example 5 : Cyclobutadiene : It has center of Symmetry as well as plane of symmetry hence optically inactive.

Example 6 : Allene : It has no center of Symmetry but has plane of symmetry hence optically inactive.

Example 7 : trans-Cyclohexane-1,4-diol : It has center of Symmetry as well as plane of symmetry hence optically inactive.

Example 8 : Cyclohexane-1,4-dione : It has center of Symmetry as well as plane of symmetry hence optically inactive.

Example 9 : Cubane : It has center of Symmetry as well as plane of symmetry hence optically inactive.

Example 10 : Lactic acid : It has neither center of symmetry nor plane of symmetry hence optically inactive.