Exam 16: Conjugated Pi Systems and Pericyclic Reactions

A) I
B) II
C) III
D) IV
E) I & IV

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A) isolated
B) cumulated
C) skipped
D) conjugated
E) none of these

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A) I
B) II
C) III
D) IV

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1. H₂SO₄, he...

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A) 1
B) 2
C) 3
D) 4
E) none

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A) the most stable product
B) the product whose formation requires the smallest free energy of activation
C) the product that can be formed in the fewest steps
D) the product that is formed at the fastest rate
E) none of these

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A) HOMO of 1,3-butadiene and LUMO of ethylene
B) LUMO of 1,3-butadiene and LUMO of ethylene
C) HOMO of 1,3-butadiene and HOMO of ethylene
D) LUMO of 1,3-butadiene and LUMO of 1,3-butadiene
E) HOMO of 1,3-butadiene and HOMO of 1,3-butadiene

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A) I
B) II
C) III
D) IV
E) V

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A) I < IV < III < II
B) III < II < I < IV
C) IV < II < III < I
D) II < IV < III < I
E) IV < III < II < I

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IV > V > I...

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A) (n $\to$ $\sigma$ *)
B) (n $\to$ $\pi$ *)
C) ( $\pi$ ₂ $\to$ $\pi$ ₃*)
D) ( $\sigma$ $\to$ $\sigma$ *)
E) ( $\pi$ ₁ $\to$ $\pi$ ₄*)

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A) 1-chloro-1-methyl-2,5-cyclohexadiene
B) 3-chloro-3-methyl-1,4-cyclohexadiene
C) 6-chloro-6-methyl-1,4-cyclohexadiene
D) 2-chloro-2-methyl-1,3-cyclohexadiene
E) None of these

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A) I
B) II
C) III
D) IV
E) II & IV

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A) I
B) II
C) III
D) IV
E) V

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