Question

Explain optical activity of 2-Chlorobutane.

Answer 1

Optical activity is the ability of a compound to rotate in the plane polarization of a beam of light that passes through it.
For a compound to be optically active one of its carbon must be chiral. It happens when there are 4 different atoms or groups attached to it. It must be asymmetrical.
$2-Chlorobutane$ is an optically active molecule. The carbon at position 2 is chiral. Hence it is optically active.