Questions #2 and #3 (L4)

2. There are four reasonable resonance structures for anthracene. Draw
them.
3. A large number of polycyclic benzenoid aromatic hydrocarbons are
known. One of these, benz/a/pyrene, is a powerful carcinogen found in
tobacco smoke. From the literature, locate and then draw the structure of
this hydrocarbon. Can you suggest other sources where this material
might be expected to be present?