Rank the following according to boiling point, highest to lowest:a. CH3CH2CH2OHb. CH3CH2(OH)CH2OHc. CH3CH2CH3d. CH2(OH)CH(OH)CH2OH

Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen

McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition

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McMurry 8th Edition

Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen

문제 6

14장, 문제 6

Rank the following according to boiling point, highest to lowest:
a. CH₃CH₂CH₂OH
b. CH₃CH₂(OH)CH₂OH
c. CH₃CH₂CH₃
d. CH₂(OH)CH(OH)CH₂OH

검증된 단계별 안내

Step 1: Understand that boiling point is influenced by intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. Key forces to consider are hydrogen bonding, dipole-dipole interactions, and London dispersion forces.

Step 2: Analyze the molecular structures of the compounds. Identify the presence of functional groups like hydroxyl (-OH) groups, which can form hydrogen bonds, significantly increasing boiling points.

Step 3: Compare the number of hydroxyl (-OH) groups in each compound: (a) CH₃CH₂CH₂OH has one -OH group, (b) CH₃CH₂(OH)CH₂OH has two -OH groups, (c) CH₃CH₂CH₃ has no -OH groups, and (d) CH₂(OH)CH(OH)CH₂OH has three -OH groups.

Step 4: Rank the compounds based on the number of hydrogen bonds they can form. Compound (d) with three -OH groups will have the highest boiling point, followed by (b) with two -OH groups, then (a) with one -OH group, and finally (c) with no -OH groups, which relies only on weaker London dispersion forces.

Step 5: Final ranking from highest to lowest boiling point is: (d) CH₂(OH)CH(OH)CH₂OH > (b) CH₃CH₂(OH)CH₂OH > (a) CH₃CH₂CH₂OH > (c) CH₃CH₂CH₃.

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주요 개념

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Boiling Point and Intermolecular Forces

The boiling point of a substance is influenced by the strength of its intermolecular forces. Stronger forces, such as hydrogen bonding, lead to higher boiling points. Alcohols, which can form hydrogen bonds due to their hydroxyl (-OH) groups, typically have higher boiling points than hydrocarbons, which primarily exhibit weaker van der Waals forces.

Hydroxyl Groups and Alcohols

Alcohols are organic compounds characterized by the presence of one or more hydroxyl (-OH) groups. The number and arrangement of these groups significantly affect the boiling point. For instance, more hydroxyl groups generally increase the potential for hydrogen bonding, thus raising the boiling point compared to hydrocarbons with no hydroxyl groups.

Structural Isomerism

Structural isomerism occurs when compounds have the same molecular formula but different structural arrangements. This can affect physical properties like boiling point. In the given compounds, variations in the position and number of hydroxyl groups lead to different boiling points, highlighting the importance of molecular structure in determining these properties.