The question is whether "to (A, B and C)" is correct, or only "(to A), (to B), and (to C)" is.
I don't have a problem with the former form, as long as there is no ambiguity. It's certainly never wrong to include the "to" every time.
Likewise, I don't think the sentence in question 2 is incorrect. With such a short sentence there is little risk of confusion.
Student or Learner