Chapter 12 Multiple Choice Questions

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. Which of the following statements regarding the S_N2 mechanism is wrong?

S_N2 reactions are bimolecular. correct incorrect

S_N2 reactions are usually second order. correct incorrect

The S_N2 mechanism occurs in one step. correct incorrect

S_N2 reactions usually occur in two steps. correct incorrect

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. Which of the following statements regarding the S_N1 mechanism is wrong?

S_N1 reactions are unimolecular. correct incorrect

S_N1 reactions are first order. correct incorrect

The S_N1 mechanism involves a single step. correct incorrect

S_N1 reactions usually occur in two steps. correct incorrect

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. Which is the most reactive compound by the S_N2 mechanism?

CH₃CH₂CH₂CH₂Br correct incorrect

(CH₃)₂CHCH₂Br correct incorrect

correct incorrect

correct incorrect

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. Which is the least reactive compound by the S_N2 mechanism?

CH₃CH₂CH₂CH₂Br correct incorrect

(CH₃)₂CHCH₂Br correct incorrect

correct incorrect

correct incorrect

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. Which is the most reactive compound by the S_N1 mechanism?

CH₂=CHCH₂Br correct incorrect

correct incorrect

CH₃CH₂CH₂Br correct incorrect

correct incorrect

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. Which is the least reactive compound by the S_N1 mechanism?

CH₂=CHCH₂Br correct incorrect

correct incorrect

CH₃CH₂CH₂Br correct incorrect

correct incorrect

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. Which is the most reactive compound by the S_N1 mechanism?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

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. Which is the least reactive compound by the S_N1 mechanism?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

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. Which is the main product of the following reaction?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

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. Which is the main product of the following reaction?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

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. Which of the following statements is wrong?

S_N1 reactions undergo partial inversion of configuration. correct incorrect

S_N2 reactions undergo partial inversion of configuration. correct incorrect

The rate constant of an S_N1 reaction depends on the solvent. correct incorrect

The rate constant of an S_N2 reaction depends on the solvent. correct incorrect

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. Which of the following statements is wrong?

S_N1 reactions proceed via carbenium ion intermediates. correct incorrect

The S_N2 mechanism does not involve an intermediate. correct incorrect

The rate constant of an S_N1 reaction depends on the nucleofuge. correct incorrect

The rate constant of an S_N2 reaction does not depend on the nucleofuge. correct incorrect

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. Which of the following statements regarding nucleophilicity is wrong?

Ethoxide ion is more nucleophilic than t-butoxide in spite of its lower basicity. correct incorrect

Ethoxide ion is more nucleophilic than t-butoxide due to the lower steric hindrance. correct incorrect

Chloride ion is more nucleophilic than iodide ion because of its higher basicity. correct incorrect

Bromide ion is more nucleophilic than fluoride in spite of its lower basicity. correct incorrect

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. Which of the following is most reactive as a nucleophile?

PhO^- correct incorrect

PhS^- correct incorrect

PhCH₂O^- correct incorrect

PhCH₂NH₂ correct incorrect

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. Which of the following is least basic?

PhO^- correct incorrect

PhS^- correct incorrect

PhCH₂O^- correct incorrect

PhCH₂NH₂ correct incorrect

* not completed

. Which is the most reactive compound by the S_N1 mechanism?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

* not completed

. Which is the least reactive compound by the S_N1 mechanism?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

* not completed

. Which is the most reactive compound by the S_N2 mechanism?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

* not completed

. Which is the least reactive compound by the S_N2 mechanism?

correct incorrect

correct incorrect

correct incorrect

correct incorrect

* not completed

. Which compound is the main product of the following reaction?

correct incorrect

correct incorrect

correct incorrect

correct incorrect