Re: Where and how exactly do you hit the chin/jaw to cause a knock out?
spar and find out. I personally like to target the bodily organs. You can't really aim for certain parts of the head due to your gloves. The nose is the easiest target for a KO because a bloody nose gets a fight stopped very quickly in the amateurs, and it's easy to hit.
The question is pointless because you're almost never going to target a certain spot, you're going to be trying to land punches in general. It's boxing not karate.