Textbook Question
The liquids 1-butanol and butanal have similar molar masses. Which is expected to have the higher boiling point? Explain your choices.
Ch.15 Aldehydes and Ketones
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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Table of contents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Not the one you use?Change textbook
Chapter 15, Problem 51
Can the alcohol (CH3)3COH be formed by the reduction of an aldehyde or ketone? Why or why not?
Verified step by step guidance1
Identify the structure of the alcohol (CH3)3COH. This is a tertiary alcohol because the carbon atom bonded to the hydroxyl (-OH) group is also attached to three other carbon atoms.
Understand the reduction process: Reduction of an aldehyde or ketone involves the addition of hydrogen (H2) to the carbonyl group (C=O), converting it into an alcohol.
Determine the type of alcohol formed by reduction: Aldehydes reduce to primary alcohols, and ketones reduce to secondary alcohols. Tertiary alcohols cannot be formed by the reduction of aldehydes or ketones.
Analyze the structure of (CH3)3COH: Since it is a tertiary alcohol, it cannot be formed by the reduction of an aldehyde or ketone. This is because the carbonyl carbon in aldehydes and ketones can only form one or two bonds with other carbon atoms, not three as required for a tertiary alcohol.
Conclude that (CH3)3COH cannot be formed by the reduction of an aldehyde or ketone because the structure of a tertiary alcohol does not align with the products of such reductions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reduction Reactions
Reduction reactions involve the gain of electrons or hydrogen, or the loss of oxygen in a chemical species. In organic chemistry, this often refers to the conversion of carbonyl compounds, such as aldehydes and ketones, into alcohols. Understanding the mechanism of reduction is crucial for determining whether a specific alcohol can be synthesized from a given carbonyl compound.
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Reduction Reactions Concept 1
Aldehydes and Ketones
Aldehydes and ketones are both types of carbonyl compounds characterized by the presence of a carbonyl group (C=O). Aldehydes have at least one hydrogen atom attached to the carbonyl carbon, while ketones have two carbon groups attached. The structural differences between these compounds influence their reactivity and the types of products that can be formed through reduction.
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Tertiary Alcohols
Tertiary alcohols are alcohols where the hydroxyl (-OH) group is attached to a carbon atom that is connected to three other carbon atoms. The compound in question, (CH₃)₃COH, is a tertiary alcohol. It cannot be formed directly by the reduction of an aldehyde or ketone, as these reactions typically yield primary or secondary alcohols, depending on the starting material.
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Related Practice
Textbook Question
The compound carvone is responsible for the odor of spearmint. Identify the functional groups in carvone.
Textbook Question
Aldosterone is a key steroid involved in controlling the sodium–potassium balance in the body. Identify the functional groups in aldosterone.
Textbook Question
Draw the structural formulas of the following compounds:
c. 2-Methoxy-2-methylpropane
Textbook Question
Many flavorings and perfumes are partially based on fragrant ketones, with far fewer being based on fragrant aldehydes. Why do you think ketones are used more frequently than aldehydes? See Section 15.5 for a clue.
Textbook Question
Acetals and ketals are usually made by reaction of an aldehyde or ketone with two molecules of a monoalcohol. If an aldehyde or ketone reacts with one molecule of a dialcohol, however, a cyclic acetal or ketal results.
b. Draw the cyclic ketal formed when the hemiketal from part (a) reacts with the ―OH labeled in blue.