You Do Need power plug adapter while traveling from Benin to India.

Here is Why You Need An Adapter

The outlet and plug type used in India are C, D and M and in Benin are C and E. This is how they look like.

Benin

In Benin, outlets of type C and E are in use.

Type C

Type E

India

In India, outlets of type C, D and M are in use.

Type C

Type D

Type M