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Exam 5: Organic Reaction Mechanisms

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Question 31

True/False

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Delocalization of electrons occurs over p orbitals that are parallel AND perpendicular to each other.

A) True
B) False

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Question 32

Multiple Choice

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Figure 1 Shown below is the structure of caffeine in the centre and two different resonance states I and II with lone pairs and formal charges omitted. -Referring to Figure 1,what is the formal charge of the oxygen atom at B?

A) +1
B) 0
C) -1
D) -2

E) All of the above
F) B) and C)

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Question 33

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Figure 1 Shown below is the structure of caffeine in the centre and two different resonance states I and II with lone pairs and formal charges omitted. -Referring to Figure 1,what is the formal charge of the nitrogen atom at E?

A curved arrow pointing to an atom in a reaction mechanism _______________ its charge integer.

A ð bond between two atoms with different electronegativities can undergo resonance.

Which of the following is the most important guideline when assessing the quality of resonance forms?

Curved arrows in reaction mechanism show the flow of atoms.

Insert curved arrows in 7-dehydrocholesterol to show how it becomes Previtamin D_.

Resonance structures require at least two neighboring atoms with p-orbitals.

Which of the following best describes carbocations?

Figure 1 Shown below is the structure of caffeine in the centre and two different resonance states I and II with lone pairs and formal charges omitted. -Referring to Figure 1,what is the formal charge of the nitrogen atom at C?

What is the product or products of the following arrow pushing?

Both ð and ó bonds can be involved in resonance.

Resonance has no effect on the stability of a structure.

What is the product or products of the following arrow pushing?

Draw curved arrows to show electron flow in the following transformation.

Given the following Lewis structure,how many lone pairs are expected to be around the sulfur and oxygen atom?

A reaction with curved arrows moving between two different molecules is an example of a(n)_______________ reaction.

The movement of a single electron in a reaction mechanism involves the use of a(n)_______________ arrow

All resonance forms have equal contribution to a resonance hybrid.