Wave Optics

The compounds are optically inactive because

Which of the following is/are optically active?

Which optically active compound on reduction with LiAlH_(4) will give optically inactive compound?

Lactic acid (2-hydroxypropanoic acid) is an optically active compound. It can be made optically inactive by

Assertion: 1,2-dichloroethane is optically active. Reason: Meso compounds are optically active.

In geometrical optics a ray of light is defined as

How many of the following are optically active ?

Which of the following compounds are optically active ?