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Electron Delocalization and Resonance. More About Molecular Orbital Theory
Practice Exercise 3

1 .       How many products are possible if a 1,2-disubstituted benzene (C6H4X2) undergoes a third substitution? [Hint]



2 .       What is meant by the term "resonance energy"? [Hint]



3 .       What is the major product obtained from the reaction of Ph-CH2-CH=CH-Ph with HCl? (Ph is a benzene ring.) [Hint]



4 .       How many important resonance contributors does CH2=CH-CH=CH-CH=CH2-CH2(+) have? [Hint]



5 .       How many carbons in aniline (C6H5NH2) possess a partial negative charge? [Hint]



6 .       Which of the following compounds has the greatest resonance energy? [Hint]



7 .       Which of the following is a tertiary benzylic cation? [Hint]



8 .       Which position in the benzyl cation has the least amount of positive charge? [Hint]



9 .       Which of the following molecules does not contain delocalized electrons? [Hint]



10 .       Which of the following compounds has an oxygen atom with a lone pair of electrons that is not involved in resonance? [Hint]



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