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.)

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.) HN N: A. Electrons in a cyclic conjugated system. I 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

An aromatic system has a 4n+2 number of electrons. Anti aromatic compond has 4n electrons.

1. Number of electrons in a system of cyclic conjugation = 4

Anti aromatic

2. Number of electrons in a system of cyclic conjugation = 0

Non-aromatic

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1. Number of electrons in a system of cyclic conjugation = 4

Aromatic

2.Number of electrons in a system of cyclic conjugation = 6

Aromatic

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1.Number of electrons in a system of cyclic conjugation = 4

Non-aromatic

2. Number of electrons in a system of cyclic conjugation = 6

Non-Aromatic (cyclic but not planar)

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