Predict whether each of the following molecules is likely to be polar or nonpolar:

(a) C₅H₅N (pyridine, a molecule like benzene except that one —CH— group is replaced by a nitrogen atom);

(b) C₂H₆ (ethane);

(c) CHCl₃ (trichloromethane, also known as chloroform, a common organic solvent and once used as an anesthetic).