BackN-Methylpyrrolidine has a boiling point of 81 °C, and piperidine has a boiling point of 106 °C.
b. Tetrahydropyran has a boiling point of 88 °C, and cyclopentanol has a boiling point of 141 °C. These two isomers have a boiling point difference of 53 °C. Explain why the two oxygen-containing isomers have a much larger boiling point difference than the two amine isomers.
List each set of compounds in order of increasing boiling point.
a. hexane, octane, and decane
Rank the following compounds from highest boiling to lowest boiling:
Explain the following:
a. 1-Hexanol has a higher boiling point than 3-hexanol.
Explain why
c. H2O (100 °C) has a higher boiling point than HF 120 °C2.
d. HF 120 °C2 has a higher boiling point than NH3 (-33 °C).
Which of the following compounds forms hydrogen bonds between its molecules?
1. CH3CH2OCH2CH2OH
2. CH3CH2N(CH3)2
3. CH3CH2CH2CH2Br
In each pair of compounds, which compound has the higher boiling point? Explain your reasoning.
c. 2,2,5-trimethylhexane or nonane
In each pair of compounds, which compound has the higher boiling point? Explain your reasoning.
b. nonane or 2-methylheptane
In each pair of compounds, which compound has the higher boiling point? Explain your reasoning.
a. octane or 2,2,3-trimethylpentane
List each set of compounds in order of increasing boiling point.
b. Octane, (CH3)3C—C(CH3)3 and CH3CH2C(CH3)2CH2CH2CH3
Choose the molecule in each pair you'd expect to have the higher boiling point. Explain your reasoning.
(b)
Ionic compounds like sodium acetate have a high melting point. Despite this, they are highly soluble in water. Why?
Despite methylcyclohexane (98.2 amu) having a higher molecular weight than toluene (92.1 amu), toluene melts at a higher temperature. Why? [Think about how the molecules can interact with each other based on their shape.]
Choose the molecule in each pair you'd expect to have the higher boiling point. Explain your reasoning.
(a) eicosane ( C20H42) vs pentadecane
Draw a picture of the hydrogen bonding in methanol.