Question

1. The carbon-carbon triple bond of an alkyne is composed of a. One ? bond and two pi bonds b. Three pi bonds c. Three ? bonds d. Two ? bonds and one pi bond 2. Which of the following describes the reactivity of alkynes a. Unlike alkenes, alkynes fail to undergo electrophilic addition reactions. b. When a symmetrical internal alkyne reacts with HBr, two products are formed. c. Three ? bonds of alkynes are greater in energy than the pi bonds, and therefore are more reactive. d. Alkynes react as electrophiles, whereas alkenes react as nucleophiles e. An alkyne is an electron-rich molecule and therefore reacts as a nucleophile. 3. What is the Major product of the following reactions. 3A CH3CH2CH2C?CH ? (Excess HBr) 3B [Benzene]-C?CH + H2O ? (H2SO4, H2O, HgSO4) 3C CH3CH2CH2?CH ? (H2O, HgSO4, H2SO4) 3D CH3CH2C?CCH3 ? (H2, Pd/C)

          1. The carbon-carbon triple bond of an alkyne is composed of
a. One ? bond and two pi bonds
b. Three pi bonds
c. Three ? bonds
d. Two ? bonds and one pi bond
2. Which of the following describes the reactivity of alkynes
a. Unlike alkenes, alkynes fail to undergo electrophilic addition reactions.
b. When a symmetrical internal alkyne reacts with HBr, two products are formed.
c. Three ? bonds of alkynes are greater in energy than the pi bonds, and therefore are more reactive.
d. Alkynes react as electrophiles, whereas alkenes react as nucleophiles
e. An alkyne is an electron-rich molecule and therefore reacts as a nucleophile.
3. What is the Major product of the following reactions.
3A CH3CH2CH2C?CH ? (Excess HBr)
3B [Benzene]-C?CH + H2O ? (H2SO4, H2O, HgSO4)
3C CH3CH2CH2?CH ? (H2O, HgSO4, H2SO4)
3D CH3CH2C?CCH3 ? (H2, Pd/C)

1. The carbon-carbon triple bond of an alkyne is composed of
a. One ? bond and two pi bonds
b. Three pi bonds
c. Three ? bonds
d. Two ? bonds and one pi bond
2. Which of the following describes the reactivity of alkynes
a. Unlike alkenes, alkynes fail to undergo electrophilic addition reactions.
b. When a symmetrical internal alkyne reacts with HBr, two products are formed.
c. Three ? bonds of alkynes are greater in energy than the pi bonds, and therefore are more reactive.
d. Alkynes react as electrophiles, whereas alkenes react as nucleophiles
e. An alkyne is an electron-rich molecule and therefore reacts as a nucleophile.
3. What is the Major product of the following reactions.
3A CH3CH2CH2C?CH ? (Excess HBr)
3B [Benzene]-C?CH + H2O ? (H2SO4, H2O, HgSO4)
3C CH3CH2CH2?CH ? (H2O, HgSO4, H2SO4)
3D CH3CH2C?CCH3 ? (H2, Pd/C)

Added by Jennifer A.

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