d)  Incorrect.  Cl₂ is a nonpolar molecule since the only bond is between identical atoms (neither is more electronegative than the other).  CH₂O
            is triangular planar.  Adding together the two C-H bonds gives a subtotal sum halfway between them directed toward the central carbon
            atom.  When this subtotal sum is added to the bond dipole for C-O double bond, they don't cancel each other out (in fact, they reinforce each
            other) thus the molecule is polar.