Review Topics] [References] For each of the species below, identify any cyclic c

Question

Review Topics] [References] 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.) 1. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) 2. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) Retry Entire Group 3 more group attempts remaining Submit Answer Previous Show Hint

Explanation / Answer

1. 4 electrons , antiaromatic

2. 16 electrons, anti aromatic

1. Zero electrons, since non cylic arrangement, non aromatic

2. 6 electrons,aromatic following Huckle rule of 4n+2 pi electrons

1. 8 electrons, antiaromatic

2. 6 electrons,aromatic

Criteria for aromaticity: it should have cylic structure,planarity,continuous delocaslisation of electrons and Huckle rule and for antiaromatic first three conditions with 4n pi electrons.

For non aromatics, disobeying any one of the above three with either Huckle rule of 4n pi electron rule.

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