I need to know the most polar bond in each molecule. HSCH2CH2OH / HC12F / HOCH2CH2NH2

Answer 1

I think I answered this yesterday. Look up the electronegativities of each element and subtract. The most polar will be the largest difference. For example, on the first molecule, S is 2.6 and H is 2.1. The difference is 0.5. That C also has a C-H bond, the difference is 2.5-2.1 or 0.4; therefore, the the SH bond is more polar than the CH bond.