4. Answer the following statements true ( T ) or false ( F ). ( 1 point each) a. The Diels-Alder reaction appears to occur in a single step. b. The electrons of benzene are part of an aromatic ring. c. The electrons of naphthalene are part of an aromatic ring. d. All three rings of anthracene can be benzenoid (aromatic) simultaneously. e. Maleic anhydride contains one carbonyl group