Yes, unless you are talking about in your vagina. Sperm dies after a few seconds out in the open. If you are asking about sperm that may have reached an awkward location, like a towel, clothing, a bed, or a plastic chair, then don't worry, you are not going to impregnate anyone. On the other hand, if it is in a vagina, the damage is done.
Yes the DNA can be erased if the hands are washed thoroughly with soap and a good strong disinfectant.
It depends on the form of sperm your talking about.
No. If so, they would be detrmental to the human body.
yes....
It depends on the kind of disenfectant, some use alcohol, some use ammonia, silver nitrate or other silver compounds or even soaps, acids or sperm
No.
If the sperm is fresh yes. If the sperm is old no.
If you put alcohol directly on sperm it will die.
No she could not get pregnant.
Yes.
None the alcohol doesn't increase sperm but my reduce it
No.