Am I able to run OS X 10.11 on my Mac or not?
Checking everymac none of the Macs listed is eligible to run 10.11 El Capitan.

The latest supported system for Xeon/Core 2 Duo processor equipped Macs from the year 2006 is 10.7.5 and 10.6.8 for Core Duo.

Being "compatible with 10.6.8" means that any Mac running 10.6.8 and supporting 10.11 can be upgraded directly. Macs supporting El Capitan either contain Core 2 Duo (2007-2010), i3/5/7 or Xeon (2008-) processors.