You Do Need power plug adapter while traveling from Serbia to Abu Dhabi.

Here is Why You Need An Adapter

The outlet and plug type used in Abu Dhabi is G and in Serbia are C and F. This is how they look like.

Serbia

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

Type C

Type F

Abu Dhabi

In Abu Dhabi, outlets of type G are in use.

Type G