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.)

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, court electrons in the largest.) NH Cytosine AElectrons in a cyclic conjugated system. B.The compound is (a, aa, or na) A Electrons in a cyclic conjugated system-6 B.The compound is (a, aa, or na) a

Explanation / Answer

1. 6 pi-electrons, Non-aromatic(because there is no complete conjugation although there are electrons available on N bonded to H but can not have conjugation throughout the ring).

2. 6 pi-electrons and complete conjugation of electrons. It is aromatic.

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