Which two orbitals from CV+ and –OH will overlap creating the C-O bond in CVOH?

Question

Which of the following accurately shows the orbital interaction that leads to bond formation between CV+ and –OH?

Answer 1

The second part is i.
Don't know first though.

Answer 2

part a is iii, iv

Answer 3

thanks!

Answer 4

above is correct

A. iii,iv
B. i