If i buy a particular call option and want to sell it today itself, my questions are 1. Can i do it. 2. If no buyer is available can i still sell it

  1. Yes you can sell on the same day.

  2. As you mentioned if there are no buyers then there is no way to sell, just place an order and pray for some buyer to hit your ask price.

U mean if i buy some call option and wants to sell it…and wat if thr is no buyyer till the end?

Ideally it should not happen and if it happens one has to wait till expiry to get it settled by exchange… Better do not enter in to those kind of illiquid contracts.