题目内容

Which of the following is least likely to be found in the product mixture which results when 2,2-dimethyl-3-pentanol is heated in phosphoric acid?()

A. E-4,4-dimethyl-2-pentene
B. Z-4,4-dimethyl-2-pentene
C. 2,3-dimethyl-2-pentene
D. 2,3-dimethyl-1-pentene
E. 4,4-dimethyl-1-pentene

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Which of the following is the strongest acid?()

A. CH3NH2
B. CH3OH
CH3SH
D. CH3OCH3
E. CH3Cl

Which of the following is the best method for preparing CH3Br?()

A. CH3OH + Br-
B. CH3OH + HBr
CH3OH + Br2
D. CH3OH + NaBr
E. CH3OH + Br+

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?

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