Symmetry and Optical Activity: Do Your Molecules Have It?

The video tutorial explains the concept of the center of symmetry in molecules, where a point allows for equidistant lines to meet similar groups or atoms, making the molecule symmetric and optically inactive. It uses the example of an A6 pointed star to illustrate symmetry. The tutorial also covers the N fold alternating axis of symmetry, where a molecule rotated and reflected across a plane results in an indistinguishable structure, making it optically inactive.

What is the role of the center of symmetry in a molecule?

• It makes the molecule optically active.

• It makes the molecule symmetric and optically inactive.

• It increases the molecular weight.

• It divides the molecule into non-superimposable images.

In the context of symmetry, what does an A6 pointed star demonstrate?

• It shows how equidistant lines can meet dissimilar points.

• It has no symmetry.

• It is an example of optical activity.

• It is a symmetrical object with a center of symmetry.

What happens when a molecule with an N fold alternating axis of symmetry is rotated and reflected?

• It becomes optically active.

• It results in an indistinguishable structure.

• It loses its symmetry.

• It becomes a different compound.

What is the result of rotating tetrahalo cyclobutane through 180° and reflecting it?

• The original structure is regained.

• A new compound is formed.

• An indistinguishable structure is obtained.

• The molecule becomes optically active.

What does a 2 fold alternating axis of symmetry indicate about a molecule?

• It has a center of symmetry.

• It is optically inactive.

• It has no symmetry.

• It is optically active.