I am installing a new sink and vanity in my home. It looks like I need
to extend the waste arm to match the drain alignment with the new sink.
Sounds easy enough... however, I have been grappling with identifying
the best way to do this as the waste arm is chromed covered and
soldered to the stub/drain.

I am considering a couple of approaches and wondering if anyone here
has any tips/suggestions. Note that I am not sure if the waste arm if
chromed covered copper or brass. Should I cut a portion of the waste
arm with a jig saw and solder a chromed cover copper/brass extension?
Or would a better option be to cut the waste arm and use some type of
transition fitting to go PVC? Since the waste arm is covered in chrome
I am not sure how difficult it will be remove the chrome for the solder
to stick.

TIA