Question

what is least polar, C-N, C-O, C-C, C-Cl, C-F

Answer 1

Hey @SarahA and welcome to \(\LARGE \sf \bbox[#40B9E9]{\color{white}{Open}}\bbox[#A8CE91]{\color{white}{Study}}\)
In order to answer this question we are going to look at the difference in electronegativity. We define a polar bound as a bound in which one atom attract shared electrons more than the other atom in the bound.
So for a polar bound to be formed, the difference in electronegativity need to be different from 0.

Lets for example look at hydrogen gas. H-H
Both hydrogen atoms got a electronegativity at about 2.2. So the difference in electronegativity is 0. This means the electrons are equally "shared".

Based on text above you should be able to figure out what bound that is least polar.

If any questions feel free to ask, else good luck!