Question 1

What are the hybridizations of the carbon atoms numbered 1 and 2 in the structure below? 1 2 H₃C-CH CH-C C-H

Accepted Answer

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Question 2

________ is produced when 1 equivalent of HBr is added to 1-hexyne.

Accepted Answer

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Question 3

Although you might expect 1-propyne to be more reactive than 1-propene in electrophilic addition reactions,the reverse is true.Explain this using your knowledge of the mechanism of electrophilic additions to both alkynes and alkenes.

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Question 4

Provide the systematic name of the compound shown.

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Question 5

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

Accepted Answer

Alkynes are generally soluble in most organic solvents. Therefore, option D improperly describes the physical properties of an alkyne.

Question 6

In the addition of hydrogen bromide to alkynes in the absence of peroxides,which of the following species is believed to be an intermediate?

Accepted Answer

In the addition of hydrogen bromide to alkynes, the intermediate believed to be formed is a vinyl cation. This is because the reaction proceeds through a mechanism where the alkyne first forms a protonated alkyne (a vinyl cation) before the bromide ion adds to it.

Question 7

The carbon-carbon triple bond of an alkyne is composed of

Accepted Answer

The carbon-carbon triple bond in an alkyne consists of one sigma (σ) bond and two pi (π) bonds. The σ bond is formed by the head-on overlap of sp-hybridized orbitals from each carbon, while the π bonds are formed by the side-to-side overlap of unhybridized p orbitals.

Question 8

Provide the structure of the major organic product of the following reaction.

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Question 9

Provide the structure of the major organic product of the following reaction.

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Question 10

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

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Question 11

Name the following compound.

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Question 12

Give the systematic name of the compound shown below.

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Question 13

Which of the following statements is not true about propyne,HC C-CH₃?

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Question 14

What are the hybridizations of the carbon atoms numbered 1 and 2 respectively in the following structure?

Accepted Answer

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Question 15

Provide the structure of (2E,4E)-2-chloro-2,4-octadiene.

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Question 16

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

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Question 17

Provide the structure of the major organic product(s)in the reaction below.

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Question 18

Which of the following is the best synthesis of 2,2-dibromopropane?

Accepted Answer

The best synthesis of 2,2-dibromopropane is CH3CHBrCHBrCH3. Option C correctly represents this structure with the correct number of carbons, bromines, and hydrogens, making it the best choice.

Question 19

What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon σ bond in ethyne?

Accepted Answer

In ethyne, the carbon-carbon bond is a triple bond consisting of one σ bond and two π bonds. The σ bond is formed by overlap of two sp hybrid orbitals, one from each carbon atom. Therefore, the two atomic orbitals or hybrid atomic orbitals that overlap to form the carbon-carbon σ bond are sp orbitals. Therefore, the best choice is E, sp-sp.

Question 20

What is the major product of the following reaction? CH₃C CH

Accepted Answer

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Quiz 7: The Reactions of Alkynes - Introduction to Multistep Synthesis

What are the hybridizations of the carbon atoms numbered 1 and 2 in the structure below? 1 2 H3C-CH CH-C C-H

________ is produced when 1 equivalent of HBr is added to 1-hexyne.

Although you might expect 1-propyne to be more reactive than 1-propene in electrophilic addition reactions,the reverse is true.Explain this using your knowledge of the mechanism of electrophilic additions to both alkynes and alkenes.

Provide the systematic name of the compound shown.

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

In the addition of hydrogen bromide to alkynes in the absence of peroxides,which of the following species is believed to be an intermediate?

The carbon-carbon triple bond of an alkyne is composed of

Provide the structure of the major organic product of the following reaction.

Provide the structure of the major organic product of the following reaction.

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

Name the following compound.

Give the systematic name of the compound shown below.

Which of the following statements is not true about propyne,HC C-CH3?

What are the hybridizations of the carbon atoms numbered 1 and 2 respectively in the following structure?

Provide the structure of (2E,4E)-2-chloro-2,4-octadiene.

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

Provide the structure of the major organic product(s)in the reaction below.

Which of the following is the best synthesis of 2,2-dibromopropane?

What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon σ bond in ethyne?

What is the major product of the following reaction? CH3C CH

What are the hybridizations of the carbon atoms numbered 1 and 2 in the structure below? 1 2 H₃C-CH CH-C C-H

Which of the following statements is not true about propyne,HC C-CH₃?

What is the major product of the following reaction? CH₃C CH