3. Which of the following reactive intermediates can best be described as both a nucleophile and a electrophile? (A) Carbanions (B) Carbocations (C) Carbenes (D) Free radicals (E) Alkanes.

2. Physostigmine is used in the treatment of glaucoma. Within this structure, the atom indicated by is most basic, while atom is least basic. (A) 1 (most basic), 4 (least basic) (B) 1 (most basic), 3 (least basic) (C) 2 (most basic), 4 (least basic) (D) 2 (most basic), 3 (least basic) (E) None of the above.