Jon Bergstrom wrote:

I am installing a new kitchen sink, and am curious if I can put the
trap in the basement directly wonder the sink, or if there is some
reason that it has to be in the cabinet under the sink? Is there a
maximum drop allowed from the sink to the trap, and if so why?
Thanks
Jon

The Codes are not universal on this, but 24" is a common spec.
The reasoning is that the un-trapped section may produce odors
from debris on the inner surface of the pipe.

If you *do* put the trap in the basement, give consideration
to how you will connect a vent to it.

Jim