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Which of the following cycloadditions is photochemically controlled?


A) [4+2]
B) [4+4]
C) [4+6]
D) [6+4]

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What is the product of the following reaction? What is the product of the following reaction? A) B) C) D)


A) What is the product of the following reaction? A) B) C) D)
B) What is the product of the following reaction? A) B) C) D)
C) What is the product of the following reaction? A) B) C) D)
D) What is the product of the following reaction? A) B) C) D)

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A dieneophile is activated with electron withdrawing groups.

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Which of the following best describes the diene shown below? Which of the following best describes the diene shown below? A) cis B) trans C) s-cis D) s-trans


A) cis
B) trans
C) s-cis
D) s-trans

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Which of the following best describes the reaction of a [2+2] cycloaddition of two alkenes?


A) thermally and photochemically forbidden
B) thermally and photochemically allowed
C) thermally allowed and photochemically forbidden
D) thermally forbidden and photochemically allowed

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Which orbital is considered the HOMO in a diene?


A) Ø1
B) Ø2
C) Ø3
D) Ø4

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Sigmatropic rearrangements are photochemically forbidden.

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Which of the following best describes a [4+2] cycloaddition?


A) thermally and photochemically forbidden
B) thermally and photochemically allowed
C) thermally allowed and photochemically forbidden
D) thermally forbidden and photochemically allowed

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Dipolar cycloadditions requires a zwitterionic compounds.

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Ketenes are capable of [2+2] thermal cycloadditions

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A [2+2] cycloaddition occurs under _______________ conditions.

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Which of the following best describes the reaction shown below? Which of the following best describes the reaction shown below? A) loss of one ð bond and gain of one á bond B) loss of one ð bond and gain of two á bonds C) loss of two ð bonds and gain of one á bond D) loss of two ð bonds and gain of two á bonds


A) loss of one ð bond and gain of one á bond
B) loss of one ð bond and gain of two á bonds
C) loss of two ð bonds and gain of one á bond
D) loss of two ð bonds and gain of two á bonds

Correct Answer

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Which of the following reactants are involved in a [4+2] cycloaddition?


A) an alkene and a diene
B) an alkene and a carbonyl
C) two alkenes
D) two dienes

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A [2+2] cycloaddition is thermally_______________.

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Which of the following best describes A and B in the following Diels-Alder reaction? Which of the following best describes A and B in the following Diels-Alder reaction? A) A and B are both electron withdrawing. B) A and B are both electron donating. C) A is electron withdrawing,and B is electron donating. D) A is electron donating,and B is electron withdrawing.


A) A and B are both electron withdrawing.
B) A and B are both electron donating.
C) A is electron withdrawing,and B is electron donating.
D) A is electron donating,and B is electron withdrawing.

Correct Answer

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What is the product of the following reaction? What is the product of the following reaction? A) B) C) D)


A) What is the product of the following reaction? A) B) C) D)
B) What is the product of the following reaction? A) B) C) D)
C) What is the product of the following reaction? A) B) C) D)
D) What is the product of the following reaction? A) B) C) D)

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Draw the product of the following reaction under both thermal and photochemical conditions. Draw the product of the following reaction under both thermal and photochemical conditions.

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The produc...

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Draw the product and the mechanism of the following reaction. Draw the product and the mechanism of the following reaction.

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The produc...

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A reaction of an alkyne and an azide is termed a [3+2] cycloaddition.

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What product is favoured in the following reaction and why? What product is favoured in the following reaction and why? A) I because of aromaticity B) I because of hyperconjugation C) II because of aromaticity D) II because of hyperconjugation


A) I because of aromaticity
B) I because of hyperconjugation
C) II because of aromaticity
D) II because of hyperconjugation

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