Domanda del libro di testo
For each molecular formula, draw all the isomeric alkynes, and give their IUPAC names. Circle the acetylenic hydrogen of each terminal alkyne.
(a) C5H8 (three isomers)
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Ch.9 - Alkynes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- 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
Capitolo 9, Problema 3
What reaction would acetylene likely undergo if it were kept at 1500°C for too long?
Guida verificata passo dopo passo1
Acetylene (C₂H₂) is a highly reactive alkyne with a triple bond between its two carbon atoms. At elevated temperatures, such as 1500 °C, it undergoes thermal decomposition or polymerization due to the instability of the molecule under such extreme conditions.
At 1500 °C, acetylene molecules can break apart into smaller fragments or recombine to form larger molecules. This process is driven by the high energy available at this temperature, which overcomes the bond dissociation energy of the triple bond.
One common reaction at this temperature is the formation of elemental carbon (C) and hydrogen gas (H₂). The reaction can be represented as:
Another possible reaction is the polymerization of acetylene to form benzene (C₆H₆) or other polycyclic aromatic hydrocarbons. This occurs when multiple acetylene molecules combine under high temperatures. For example:
In summary, if acetylene is kept at 1500 °C for too long, it is likely to undergo thermal decomposition into carbon and hydrogen gas or polymerization to form larger hydrocarbons such as benzene. These reactions are a result of the instability of acetylene at high temperatures.
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Acetylene Structure and Properties
Acetylene (C2H2) is a simple alkyne characterized by a triple bond between two carbon atoms. This structure makes it highly reactive, particularly at elevated temperatures. Understanding its bonding and molecular geometry is crucial for predicting its behavior in chemical reactions.
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Percorso guidato
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Polymers Structure and Properties Concept 1
Thermal Decomposition
At high temperatures, organic compounds like acetylene can undergo thermal decomposition, where the compound breaks down into simpler molecules or elements. This process can lead to the formation of carbon and hydrogen gas, as well as other hydrocarbons, depending on the conditions and duration of heating.
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Combustion Reactions
Combustion reactions involve the reaction of a substance with oxygen, producing heat and light. Acetylene can combust at high temperatures, leading to the formation of carbon dioxide and water. Understanding combustion is essential for predicting the products and energy changes associated with heating acetylene.
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02:55Heat of Combustion
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The boiling points of hex-1-ene (64 °C) and hex-1-yne (71 °C) are sufficiently close that it is difficult to achieve a clean separation by distillation. Show how you might use the acidity of hex-1-yne to remove the last trace of it from a sample of hex-1-ene.
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For each molecular formula, draw all the isomeric alkynes, and give their IUPAC names. Circle the acetylenic hydrogen of each terminal alkyne.
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c. H—C≡C—H + NaOCH3
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