Define each term and give an example.
(a) a heterocyclic aromatic compound
(b) an antiaromatic compound
(c) a Kekulé structure
(d) an annulene
(e) degenerate orbitals
(f) the polygon rule
(g) a polynuclear aromatic heterocycle
(h) fused rings
(i) a polynuclear aromatic hydrocarbon
(j) the benzenoid UV band
(k) a filled shell of MOs
(l) Hückel’s rule
(m) resonance energy
(n) an aryl group
(o) a meta-disubstituted benzene
(p) allotropes of carbon
(q) a fullerene
(r) an aliphatic compound
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