Ahsoka Tano's fate is unknown; she left the Jedi Order at the end of Season 5, so her odds of being killed during Order 66 are highly unlikely, but there's no solid evidence of that yet
No, In one episode she dos die but then comes back to life but she does NOT die. (I have watched that episode so I know) :)
No
The answer is yes
mr pink
Rex's fate has not been confirmed as of yet, just like Ahsoka. So we'll have to wait until the Season 3 finale of the show airs on Cartoon Network.
"Orders"
yes
Dengar didn't die in The Clone Wars. You might have it confused with someone else
only in the new series
Echo did not die in clone wars he showed up in season seven
No. Count Dooku dies in Revenge of the Sith.
Ahsoka and Barriss Offee are taking a medical frigate to a medical center (Kit Fisto is there). Brain controlling parasites invade clone troopers brains, forcing them to turn against the jedi. After all the clones are invaded, Barriss feels that they should split up. Barriss gets controlled then duels Ahsoka. Ahsoka contacts her master, while hiding, and asks him what to do. Anakin says make it cold. Ahsoka turns of heater then pulls pipes that shoot frost into Barriss's face, then all parasites die. Anakin has a talk with his Padawan.