Practice Exercise 1

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Chapter 7: Delocalized Electrons and their Effect on Stability, Reactivity, and pK_a - Ultraviolet and Visible Spectroscopy

Exercises

Practice Exercise 1

This activity contains 6 questions.

If benzene had completely localized double bonds, how many dibromo-substituted benzenes would be possible?

	1
	2
	3
	4
	5

Which of the following compounds contains a nitrogen atom whose lone pair electrons are not involved in resonance?

CH₃CH=CHNH₂CH₃NHCH₂CH=CH₂CH₃-C(=O)-NH₂C₆H₅-NHCH₃CH₃-C(=O)-NHCH₃

How large are the C-C-C angles in benzene?

60 degrees90 degrees109.5 degrees120 degrees139 degrees

Which of the following instructions does not lead to a correct resonance structure?

Move pi electrons toward a positive charge.Move pi electrons toward a pi bond.Move lone pair electrons toward a positive charge.Move lone pair electrons toward a negative charge.Move a single nonbonding electron toward a pi bond.

How many resonance structures are important for CH₂=CH—CH=CH-(+)CH₂, and of these, how many are degenerate pairs?

3 resonance structures, including 1 degenerate pair4 resonance structures, no degenerate pairs4 resonance structures, including 1 degenerate pair3 resonance structures, no degenerate pairs5 resonance structures, including 2 degenerate pairs

Which of the following compounds has delocalized electrons?

1,4-cyclohexadiene1,6-heptadiene1,4-heptadiene1,5-heptadiene1,3-heptadiene

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