Textbook Question
Draw the organic products you would expect to isolate from the following reactions (after hydrolysis).
(c)
(d)
2
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Ch.10 - Structure and Synthesis of Alcohols
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 10, Problem 35a
Predict which member of each group is most soluble in water, and explain the reasons for your predictions.
a. butan-1-ol, pentan-1-ol, or propan-2-ol
Verified step by step guidance1
Step 1: Understand the concept of solubility in water. Solubility in water is influenced by the ability of a molecule to form hydrogen bonds with water. Molecules with polar functional groups, such as hydroxyl (-OH) groups, can form hydrogen bonds, increasing their solubility.
Step 2: Analyze the molecular structures of the compounds. Butan-1-ol, pentan-1-ol, and propan-2-ol all contain a hydroxyl (-OH) group, which can form hydrogen bonds with water. However, the solubility is also affected by the size of the hydrophobic (nonpolar) alkyl chain.
Step 3: Compare the alkyl chain lengths. Butan-1-ol has a four-carbon chain, pentan-1-ol has a five-carbon chain, and propan-2-ol has a three-carbon chain. Longer alkyl chains increase the hydrophobic character of the molecule, reducing solubility in water.
Step 4: Consider the branching in propan-2-ol. Branched molecules, like propan-2-ol, tend to be more soluble in water than their straight-chain counterparts because branching reduces the effective hydrophobic surface area.
Step 5: Predict the order of solubility. Based on the above analysis, propan-2-ol is expected to be the most soluble in water due to its shorter chain and branching. Butan-1-ol is next, followed by pentan-1-ol, which has the longest and least soluble alkyl chain.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hydrophilicity and Hydrophobicity
Hydrophilicity refers to the affinity of a molecule for water, while hydrophobicity indicates a lack of such affinity. Molecules with polar functional groups, such as alcohols, tend to be hydrophilic due to their ability to form hydrogen bonds with water. In contrast, larger hydrocarbon chains contribute to hydrophobic characteristics, reducing overall solubility in water.
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Alcohol Functional Group
Alcohols contain a hydroxyl (-OH) functional group, which is responsible for their solubility in water. The presence of this polar group allows alcohols to engage in hydrogen bonding with water molecules, enhancing their solubility. The position and number of hydroxyl groups, as well as the length of the carbon chain, influence the overall solubility of the alcohol.
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Chain Length and Solubility
The length of the carbon chain in alcohols affects their solubility in water. Shorter-chain alcohols, like butan-1-ol and propan-2-ol, are generally more soluble due to a higher proportion of polar -OH groups relative to the nonpolar hydrocarbon part. As the carbon chain length increases, the hydrophobic character dominates, leading to decreased solubility in water.
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Related Practice
Textbook Question
Draw the organic products you would expect to isolate from the following reactions (after hydrolysis).
(a)
(b)
1
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Textbook Question
Predict which member of each pair is more acidic, and explain the reasons for your predictions.
b. cyclohexanol or cyclohexanethiol
2
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Textbook Question
Predict which member of each pair has the higher boiling point, and explain the reasons for your predictions.
a. hexan-1-ol or 3,3-dimethylbutan-1-ol
b. hexan-2-one or hexan-2-ol
1
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Textbook Question
Predict which member of each pair is more acidic, and explain the reasons for your predictions.
a. cyclopentanol or 3-chlorophenol
1
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Textbook Question
Predict which member of each group is most soluble in water, and explain the reasons for your predictions.
b. chlorocyclohexane, cyclohexanol, or cyclohexane-1,2-diol
1
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