题目内容

When dipentyl ether is treated with excess HI, through what type of mechanisms does the major product result?()

A. SN2
B. SN1
C. both SN1 and SN2
D. E1
E2

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CH3CH2Br + -OH → ?Assuming no other changes, what is the effect of doubling only the concentration of the alkyl halide in the above SN2 reaction?

A. no change
B. doubles the rate
C. triples the rate
D. quadruples the rate
E. rate is halved

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What is the major product which results when (2R,3S)-2-chloro-3-phenylbutane is treated with sodium methoxide in methanol?()提示：这道题考察的是大家对于E2消除中，反式共平面的认识。反式共平面要求再纽曼投影式中，氢和离去基团（Cl）必须处于反式共平面。

A. 2-phenyl-1-butene
B. Z-2-phenyl-2-butene
C. S-3-phenyl-1-butene
D. R-3-phenyl-1-butene
E. R-2-methoxy-2-phenylbutane

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Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product?

A. 1-chloropentane
B. 2-chloropentane
C. 3-chloropentane
D. 1-chloro-2-methylbutane
E. 1-chloro-3-methylbutane

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Which of the following does not provide evidence that there are two different mechanisms for nucleophilic substitution?()这道题很有代表性和难度，请认真思考

A. reaction products when CH3I is used as the substrate
B. reaction products when (CH3)3CCH2I is used as substrate
C. the stereochemistry of nucleophilic substitutions
D. the effect of nucleophile concentration on rate

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When dipentyl ether is treated with excess HI, through what type of mechanisms does the major product result?()

A. SN2 B. SN1 C. both SN1 and SN2 D. E1 E2

CH3CH2Br + -OH → ?Assuming no other changes, what is the effect of doubling only the concentration of the alkyl halide in the above SN2 reaction?

Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product?

Which of the following does not provide evidence that there are two different mechanisms for nucleophilic substitution?()这道题很有代表性和难度，请认真思考

A. SN2
B. SN1
C. both SN1 and SN2
D. E1
E2