[Q] OS X Mountain Lion on my old MacBook A1181


I have an old MacBook A1181, intel core 2 duo 2ghz with 2 gb RAM running OS X leopard. Yes Leopard!!!

Am planning to upgrade it to 4 gb RAM and later upgrade the operating system. Can it run OS X. Mountain lion or Lion? And do I have to purchase each iteration of OS X in between ie if I want to upgrade to Mountain Lion, will I have to purchase snow leopard and lion?