16- 1 8 (a) (b) ( .. ;�: / \ :N�.S.: 0 aromatic: 4 n aromatic: 4 n electrons in electrons in double bonds double bonds (c) d 0 not aromatic: no cyclic n system (d) H H (�)�6 o 0+ .. . . plus one pair plus one pair because of sp3 aromatic: cation on carbon-4 indicates an empty p orbital; two n bonds plus a pair of electrons from oxygen makes a 6 n electron system from oxygen from sulfur carbon .. -(e)6�6 o 0 + (f)O I .. sp3 N H .. . . aromatic: resonance fonn shows "push-pull" of electrons from one 0 to the other, making a cyclic n system with 6 electrons not aromatic: no cyclic n system because of sp
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