Are the following molecules polar or non-polar? In each case give a reason for your answer. (Electronegativity values: F = 4.0, Cl = 3.0, Br = 2.8, S = 2.5, C = 2.5, H = 2.1)

a. Chlorine, Cl₂

b. Hydrogen fluoride, HF

c. The V-shaped molecule, sulfur dichloride, SCl₂

d. The tetrahedral molecule, chloromethane, CH₃Cl

e. The tetrahedral molecule tetrabromomethane, CBr₄.