(a) Using the curved-arrow notation, derive a resonance structure for the allyl cation

Chapter 3, Problem 3.6

(choose chapter or problem)

(a) Using the curved-arrow notation, derive a resonance structure for the allyl cation (shown here) which shows that each carboncarbon bond has a bond order of 1.5 and that the positive charge is shared equally by both terminal carbon atoms. (A bond with a bond order of 1.5 has the character of a single bond plus one-half of a double bond.) (b) Using the curved-arrow notation, derive a resonance structure for the allyl anion (shown here) which shows that the two carboncarbon bonds have an identical bond order of 1.5 and that the unshared electron pair (and negative charge) is shared equally by the two terminal carbons. (c) Using the curved-arrow notation, derive a resonance structure for benzene (shown here) which shows that all carboncarbon bonds are identical and have a bond order of 1.5.