Domanda del libro di testo
Draw a structure for a compound that meets each of the following descriptions:
b. An aldehyde with four carbons
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Ch.15 Aldehydes and Ketones
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- 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: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 15, Problema 21
A fundamental difference between aldehydes and ketones is that one can be oxidized to carboxylic acids but the other cannot. Which is which? Give an example of a test to differentiate aldehydes from ketones.
Guida verificata passo dopo passo1
Aldehydes and ketones are both carbonyl-containing compounds, but aldehydes have at least one hydrogen atom attached to the carbonyl carbon, while ketones have two alkyl or aryl groups attached to the carbonyl carbon.
Aldehydes can be oxidized to carboxylic acids because the hydrogen atom attached to the carbonyl carbon can be replaced by a hydroxyl group during oxidation. Ketones, on the other hand, cannot be oxidized further under normal conditions because they lack this hydrogen atom.
To differentiate aldehydes from ketones, a common test is the Tollens' test. In this test, Tollens' reagent (a solution of silver nitrate in ammonia) is used. Aldehydes reduce the silver ions (Ag⁺) in the reagent to metallic silver (Ag), forming a shiny silver mirror on the test tube. Ketones do not react with Tollens' reagent.
Another test to distinguish aldehydes from ketones is the Fehling's test. In this test, aldehydes reduce the copper(II) ions (Cu²⁺) in Fehling's solution to copper(I) oxide (Cu₂O), which precipitates as a red solid. Ketones do not react with Fehling's solution.
For example, formaldehyde (HCHO) is an aldehyde that will give a positive Tollens' or Fehling's test, while acetone (CH₃COCH₃) is a ketone that will not react in these tests.
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Aldehydes
Aldehydes are organic compounds characterized by the presence of a carbonyl group (C=O) at the end of a carbon chain. This structural feature allows aldehydes to be easily oxidized to carboxylic acids. A common example of an aldehyde is formaldehyde, which can be oxidized to formic acid.
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0:34
Naming Aldehydes Example 2
Ketones
Ketones are organic compounds that also contain a carbonyl group, but this group is located within the carbon chain, not at the end. Due to this structural difference, ketones are generally resistant to oxidation and cannot be converted to carboxylic acids. An example of a ketone is acetone, which does not undergo oxidation to form a carboxylic acid.
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1:29Ketone Bodies Concept 1
Oxidation Tests
Oxidation tests are chemical reactions used to differentiate between aldehydes and ketones based on their reactivity. One common test is the Tollens' test, where aldehydes reduce silver ions to metallic silver, resulting in a silver mirror on the test tube's surface, while ketones do not produce this reaction. This test effectively highlights the oxidizable nature of aldehydes compared to ketones.
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1:19Benedict's Test Concept 3
Pratica correlata
Domanda del libro di testo
The carbonyl group can be reduced by addition of a hydride ion (H–) and (H+) a proton. Removal of H– and H+ from an alcohol results in a carbonyl group.
a. To which atom of the carbonyl is the hydride ion added and why?
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Domanda del libro di testo
The carbonyl group can be reduced by addition of a hydride ion (H–) and (H+) a proton. Removal of H– and H+ from an alcohol results in a carbonyl group.
b. In the reaction, indicate which direction represents reduction and which represents oxidation.
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Domanda del libro di testo
For each compound shown next, determine whether it is a hemiacetal, a hemiketal, an acetal, or a ketal.
a.
b.
c.
d.
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Domanda del libro di testo
Glucose is the major sugar in mammalian blood. We often see it represented as either the "free aldehyde" or the cyclic hemiacetal forms shown here. Of the two forms of glucose, the cyclic hemiacetal is the preferred form found in blood. Can you suggest two reasons why?
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Domanda del libro di testo
Draw a structure for a compound that meets each of the following descriptions:
a. A 6-carbon cyclic ketone with a methyl group on the beta carbon
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