题目内容

Which of the following correctly describes the relative nucleophilicities of methoxide and tert-butoxide?()

A. These alkoxides have essentially the same nucleophilicities since the negative charge in both is localized on an oxygen atom.
B. Methoxide is more nucleophilic because the nucleophilicity of tert-butoxide is diminished by steric effects.
C. tert-Butoxide is more nucleophilic because it contains three methyl groups which increase the charge on its oxygen by donating electron density.
D. tert-Butoxide is more nucleophilic because it is more basic.
E. none of the above

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Which of the following is the rate law for SN1 mechanisms?()

A. Rate = k[Alkyl Halide] [Nucleophile]
B. Rate = k[Nucleophile]
C. Rate = k[Alkyl Halide]
D. Rate = k[Alkyl Halide] [Nucleophile] + k2[Alkyl Halide]
E. Rate = k1[Alkyl Halide] + k2[Nucleophile]

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In the SN1 hydrolysis mechanism of (CH3)3CBr, there are elementary steps, distinct transition states, and distinct intermediates.()

A. 2; 2; 2
B. 2; 2; 3
C. 2; 3; 2
D. 3; 2; 3
E. 3; 3; 2

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Which of the following is the best leaving group?()

A. HO-
B. F-
Cl-
D. Br-
E. I-

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Identify the alkyl halide that reacts the fastest in an SN1 reaction.()

A. 2-chloro-2-methylpropane
B. 2-chlorobutane
C. 1-chlorobutane
D. chloromethane

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Which of the following correctly describes the relative nucleophilicities of methoxide and tert-butoxide?()

Which of the following is the rate law for SN1 mechanisms?()

In the SN1 hydrolysis mechanism of (CH3)3CBr, there are ________ elementary steps, ________ distinct transition states, and ________ distinct intermediates.()

Which of the following is the best leaving group?()

Identify the alkyl halide that reacts the fastest in an SN1 reaction.()

In the SN1 hydrolysis mechanism of (CH3)3CBr, there are elementary steps, distinct transition states, and distinct intermediates.()