Q3:Am i able to transfer leadership to another active member of my clan,supposing i am unable to be leader?If yes, can i take back leadership if i want?
Pretty sure there's no official protocol for this kind of stuff. Based on what I've seen some clans do before, things like this entirely depend on the clan. One thing I'm very certain of is that you can transfer leadership to someone and even ask a moderator to change the poster of thread to the new leader.
The answer to the other question entirely depends on the decision of the clan. If you tell everyone that you'll just take a temporary leave or something, and you'll assign someone as an interim leader that will take care of things while you're gone, then I'm sure you can back the leadership whenever you see fit. At least, that's what usually happens.
However, if you leave and say it's permanent, then you'll have no right or responsibility to the clan anymore. If you decide to suddenly come back and take back the leadership, then the decision will depend on the members of the clan. If they readily welcome you and the current leader happily relinquishes his duties to you, then I guess you can do that. But if they reject you, then you'll have no right to complain or anything like that because the clan isn't really yours anymore.
NOTE: I'm no mod or anything so don't take what I wrote here as fact.