For each of the species below, identify any cyclic conjugated system, then: A. D

Question

For each of the species below, identify any cyclic conjugated system, then:

A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation).
B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic).
(Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.)

A.Electrons in a cyclic conjugated system.
B.The compound is (a, aa, or na).

A.Electrons in a cyclic conjugated system.
B.The compound is (a, aa, or na).

A.Electrons in a cyclic conjugated system.
B.The compound is (a, aa, or na).

A.Electrons in a cyclic conjugated system.
B.The compound is (a, aa, or na).

Explanation / Answer

1)

a) 4e-

b) anti aromatic

2)

a) 6e-

b) aromatic

3)

a) 8e-

b) anti aromatic

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