题目内容

The reagent needed to convert 2-butyne to cis-2-butene is ________.()

A. H2/Pt
B. H2/Lindlar's catalyst
C. H+/Zinc dust
D. Li/NH3
E. Na/NH3

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Which of the following improperly describes the physical properties of an alkyne? ()

A. relatively nonpolar
B. nearly insoluble in water
C. less dense than water
D. insoluble in most organic solvents

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Which of the following statements correctly describes the general reactivity of alkynes? ()

An alkyne is an electron-rich molecule and therefore reacts as a nucleophile.
B. The σ bonds of alkynes are higher in energy than the π bonds and are thus more reactive.
C. Unlike alkenes, alkynes fail to undergo electrophilic addition reactions.
D. Alkynes are generally more reactive than alkenes.
E. Alkynes react as electrophiles, whereas alkenes react as nucleophiles.

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Which of the following compounds is the major product when 1-hexyne is treated with excess HBr? ()

A. 1,1-dibromohexane
B. 1,1-dibromohexene
C. 1,2-dibromohexene
D. 1,2-dibromohexane
E. 2,2-dibromohexane

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A mixture of 1-heptyne, 2-heptyne, and 3-heptyne was hydrogenated in the presence of a platinum catalyst until hydrogen uptake ceased. If one assumes that the hydrogenation went to completion, how many distinct seven-carbon hydrocarbons were produced?()

A. 1
B. 2
C. 3
D. 6
E. 8

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The reagent needed to convert 2-butyne to cis-2-butene is ________.()

A. H2/Pt B. H2/Lindlar's catalyst C. H+/Zinc dust D. Li/NH3 E. Na/NH3

Which of the following improperly describes the physical properties of an alkyne? ()

Which of the following statements correctly describes the general reactivity of alkynes? ()

Which of the following compounds is the major product when 1-hexyne is treated with excess HBr? ()

A mixture of 1-heptyne, 2-heptyne, and 3-heptyne was hydrogenated in the presence of a platinum catalyst until hydrogen uptake ceased. If one assumes that the hydrogenation went to completion, how many distinct seven-carbon hydrocarbons were produced?()

A. H2/Pt
B. H2/Lindlar's catalyst
C. H+/Zinc dust
D. Li/NH3
E. Na/NH3