For each of the species below, identify any cyclic conjugated system, then A. De
ID: 1085864 • Letter: F
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.) 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)Explanation / Answer
A. 1. 10 electrons, aromatic
2. Zero (no cyclic array of conjugation), non Aromatic
B. 1. 6 electrons (4 in two double bonds and 2 on nitrogen), Aromatic
2. 6 electrons (in 3 double bonds), Aromatic
Criteria for aromaticity : cyclic structure, planarity, continuous delocalisation of pi electrons and Huckle's rule of 4n +2 pi electrons
Anti aromatic - 4n pi electrons with first three conditions
Non Aromatic - fails any one of the above three conditions with either 4n+2 or 4n pi electrons.
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