You Do Need power plug adapter while traveling from Balearic Islands to Brazil.

Here is Why You Need An Adapter

The outlet and plug type used in Brazil are C and N and in Balearic Islands are C and F. This is how they look like.

Balearic Islands

In Balearic Islands, outlets of type C and F are in use.

Type C

Type F

Brazil

In Brazil, outlets of type C and N are in use.

Type C

Type N