Question 1

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 bond and two pi bonds, as each carbon atom is connected to another carbon atom through a sigma bond and two parallel pi bonds involve the overlap of their respective p-orbitals.

Question 2

In trans-hept-4-en-2-yne the shortest carbon-carbon bond is between carbons ________.

Accepted Answer

In the trans configuration, the double bond between carbons 2 and 3 causes the adjacent carbon-carbon bond to be shorter than the bond between carbons 3 and 4. Therefore, the shortest carbon-carbon bond is between carbons 2 and 3.

Question 3

Which of the species below is less basic than acetylide?

Accepted Answer

The answer of Which of the species below is less...

Question 4

What is the pKa of a terminal alkyne?

Accepted Answer

The pKa of a terminal alkyne is approximately 25, indicating its acidity compared to other hydrocarbons.

Question 5

Provide the major organic product of the reaction below.

Accepted Answer

The answer of Provide the major organic product of the...

Question 6

Why are terminal alkynes more acidic then other hydrocarbons?

Accepted Answer

The answer of Why are terminal alkynes more acidic then...

Question 7

Which of the following $\underline{\text{ improperly  }}$ describes the physical properties of an alkyne?

Accepted Answer

Alkynes are generally soluble in organic solvents such as benzene and diethyl ether, making option D incorrect.

Question 8

How many moles of oxygen are required in the complete combustion of 1 mole of acetylene?

Accepted Answer

The answer of How many moles of oxygen are required...

Question 9

The pi bond of an alkyne is ________ and ________ than the pi bond of an alkene.

Accepted Answer

The answer of The pi bond of an alkyne is...

Question 10

What is the correct IUPAC name for the following compound?

Accepted Answer

The answer of What is the correct IUPAC name for...

Question 11

Among the compounds water, but-1-yne, but-2-yne, and ethane, which are stronger acids than ammonia?

Accepted Answer

Water and but-1-yne are stronger acids than ammonia. Water has a pKa of about 15.7, and but-1-yne has a pKa of about 25, both of which are lower than ammonia's pKa of about 36, indicating they are stronger acids.

Question 12

How many moles of water are produced when one mole of propyne undergoes complete combustion?

Accepted Answer

The answer of How many moles of water are produced...

Question 13

Explain why the synthetic route shown below would be unsuccessful. H-C≡C:^- Na⁺ H₃CH₂C-C≡C-CH₂CH₃ 3. CH₃CH₂I

Accepted Answer

The answer of Explain why the synthetic route shown below...

Question 14

To a solution of propyne in diethyl ether, one molar equivalent of CH₃Li was added and the resulting mixture was stirred for 0.5 hour. After this time, an excess of D₂O was added. Describe the major organic product(s) of this reaction.

Accepted Answer

The answer of To a solution of propyne in diethyl...

Question 15

Circle the shortest bond in the compound below.

Accepted Answer

The answer of Circle the shortest bond in the compound...

Question 16

Provide the IUPAC name for the compound below.

Accepted Answer

The answer of Provide the IUPAC name for the compound...

Question 17

The correct IUPAC name for the following structure is ________.

Accepted Answer

The answer of The correct IUPAC name for the following...

Question 18

Give the IUPAC name for CHS1U1B13S1U1B0CH=CHCH=CHC≡CCHS1U1B13S1U1B0

Accepted Answer

The answer of Give the IUPAC name for CHS1U1B13S1U1B0CH=CHCH=CHC≡CCHS1U1B13S1U1B0...

Question 19

Which of the following alkynes has the lowest boiling point?

Accepted Answer

3,3-dimethyl-1-butyne has the lowest boiling point because it is the smallest and most branched molecule among the options, leading to weaker van der Waals forces.

Question 20

What products result when calcium carbide is combined with water?

Accepted Answer

The answer of What products result when calcium carbide is...

Quiz 9: Alkynes

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

In trans-hept-4-en-2-yne the shortest carbon-carbon bond is between carbons ________.

Which of the species below is less basic than acetylide?

What is the pKa of a terminal alkyne?

Provide the major organic product of the reaction below.

Why are terminal alkynes more acidic then other hydrocarbons?

Which of the following $\underline{\text{ improperly }}$ describes the physical properties of an alkyne?

How many moles of oxygen are required in the complete combustion of 1 mole of acetylene?

The pi bond of an alkyne is and than the pi bond of an alkene.

What is the correct IUPAC name for the following compound?

Among the compounds water, but-1-yne, but-2-yne, and ethane, which are stronger acids than ammonia?

How many moles of water are produced when one mole of propyne undergoes complete combustion?

Explain why the synthetic route shown below would be unsuccessful. H-C≡C:^- Na⁺ H₃CH₂C-C≡C-CH₂CH₃ 3. CH₃CH₂I

To a solution of propyne in diethyl ether, one molar equivalent of CH₃Li was added and the resulting mixture was stirred for 0.5 hour. After this time, an excess of D₂O was added. Describe the major organic product(s) of this reaction.

Circle the shortest bond in the compound below.

Provide the IUPAC name for the compound below.

The correct IUPAC name for the following structure is ________.

Give the IUPAC name for CH₃CH=CHCH=CHC≡CCH₃

Which of the following alkynes has the lowest boiling point?

What products result when calcium carbide is combined with water?

Quiz 9: Alkynes

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

In trans-hept-4-en-2-yne the shortest carbon-carbon bond is between carbons ________.

Which of the species below is less basic than acetylide?

What is the pKa of a terminal alkyne?

Provide the major organic product of the reaction below.

Why are terminal alkynes more acidic then other hydrocarbons?

Which of the following improperly ‾\underline{\text{ improperly }} improperly ​ describes the physical properties of an alkyne?

How many moles of oxygen are required in the complete combustion of 1 mole of acetylene?

The pi bond of an alkyne is ________ and ________ than the pi bond of an alkene.

What is the correct IUPAC name for the following compound?

Among the compounds water, but-1-yne, but-2-yne, and ethane, which are stronger acids than ammonia?

How many moles of water are produced when one mole of propyne undergoes complete combustion?

Explain why the synthetic route shown below would be unsuccessful. H-C≡C:- Na+ H3CH2C-C≡C-CH2CH3 3. CH3CH2I

To a solution of propyne in diethyl ether, one molar equivalent of CH3Li was added and the resulting mixture was stirred for 0.5 hour. After this time, an excess of D2O was added. Describe the major organic product(s) of this reaction.

Circle the shortest bond in the compound below.

Provide the IUPAC name for the compound below.

The correct IUPAC name for the following structure is ________.

Give the IUPAC name for CH3CH=CHCH=CHC≡CCH3

Which of the following alkynes has the lowest boiling point?

What products result when calcium carbide is combined with water?

Which of the following $\underline{\text{ improperly }}$ describes the physical properties of an alkyne?

The pi bond of an alkyne is and than the pi bond of an alkene.

Explain why the synthetic route shown below would be unsuccessful. H-C≡C:^- Na⁺ H₃CH₂C-C≡C-CH₂CH₃ 3. CH₃CH₂I

To a solution of propyne in diethyl ether, one molar equivalent of CH₃Li was added and the resulting mixture was stirred for 0.5 hour. After this time, an excess of D₂O was added. Describe the major organic product(s) of this reaction.

Give the IUPAC name for CH₃CH=CHCH=CHC≡CCH₃