Properties and Uses of Unsaturated Hydrocarbons

Question 1

Question 1

Revolt · Accepted Answer

2-butyne

Question 2

Question 2

Revolt · Accepted Answer

cis-2-pentene

Question 3

Question 3

Revolt · Accepted Answer

trans-3-decene

Question 4

Question 4

Revolt · Accepted Answer

1-hexyne

Question 5

Compare the boiling points of 1-pentyne and 1-octyne. Compare the vapor pressure curves of 1-butene and 1-heptene. Explain your reasoning.

Revolt · Accepted Answer

1-pentyne has a lower boiling point than 1-octyne because it has a shorter carbon chain and weaker intermolecular forces. Similarly, 1-butene has a higher vapor pressure at lower temperatures than 1-heptene because smaller molecules evaporate more easily. These differences occur because larger molecules have stronger London dispersion forces, meaning more energy is required to overcome these attractions to move the molecules from the liquid phase into the vapor phase.

Question 6

Did your answers include all of the following?

Revolt · Accepted Answer

1-pentyne has a lower boiling point than 1-octyne.; 1-butene has higher vapor pressures at lower temperatures than 1-heptene.; The differences in boiling points and vapor pressures result from differences in the chain lengths of the molecules.; Larger molecules have stronger intermolecular forces of attraction than smaller molecules.; More energy is required to move larger molecules into the vapor phase from the liquid state.

Properties and Uses of Unsaturated Hydrocarbons Answers

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