Textbook Question
Determine the degree of unsaturation and then draw possible structures for noncyclic compounds with the following molecular formulas:
a. C3H6
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Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 5b
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 5bChapter 6, Problem 5b
Determine the degree of unsaturation and then draw possible structures for noncyclic compounds with the following molecular formulas:
b. C3H4
Verified step by step guidance1
Step 1: Understand the concept of degree of unsaturation. The degree of unsaturation (also called the index of hydrogen deficiency) indicates the number of π bonds or rings in a molecule. It is calculated using the formula: \( \text{Degree of Unsaturation} = rac{2C + 2 - H}{2} \), where \( C \) is the number of carbon atoms, \( H \) is the number of hydrogen atoms, and other elements like oxygen or halogens are accounted for separately.
Step 2: Apply the formula to the given molecular formula \( C_3H_4 \). Substitute \( C = 3 \) and \( H = 4 \) into the formula: \( \text{Degree of Unsaturation} = rac{2(3) + 2 - 4}{2} \). Simplify the expression to determine the degree of unsaturation.
Step 3: Interpret the result. A degree of unsaturation of 2 means the molecule has two π bonds, two rings, or one π bond and one ring. Since the problem specifies noncyclic compounds, focus on structures with π bonds only.
Step 4: Draw possible structures for \( C_3H_4 \) that satisfy the degree of unsaturation. Consider linear arrangements of the carbon atoms and distribute the π bonds accordingly. Examples include molecules with triple bonds (alkynes) or two double bonds (dienes).
Step 5: Verify the structures. Ensure that each proposed structure adheres to the molecular formula \( C_3H_4 \), satisfies the degree of unsaturation, and follows the rules of valency for carbon and hydrogen atoms.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Degree of Unsaturation
The degree of unsaturation (DU) indicates the number of rings and/or multiple bonds in a molecule. It can be calculated using the formula DU = (2C + 2 + N - H - X)/2, where C is the number of carbons, N is the number of nitrogens, H is the number of hydrogens, and X is the number of halogens. A higher DU suggests more double bonds or rings, which significantly influences the compound's reactivity and structure.
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The difference between saturated and unsaturated molecules.
Structural Isomers
Structural isomers are compounds that have the same molecular formula but differ in the arrangement of atoms. For C3H4, possible structural isomers include alkenes and alkynes, which can exhibit different connectivity of carbon atoms and functional groups. Understanding structural isomerism is crucial for predicting the physical and chemical properties of the compounds.
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Noncyclic Compounds
Noncyclic compounds are organic molecules that do not contain any rings in their structure. For the molecular formula C3H4, noncyclic compounds can include alkenes (with a double bond) and alkynes (with a triple bond). Recognizing the distinction between cyclic and noncyclic structures is essential for accurately drawing and interpreting the possible configurations of a given molecular formula.
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Related Practice
Textbook Question
What is each compound's systematic name?
c.
d.
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Textbook Question
Several studies have shown that β-carotene, a precursor of vitamin A, may play a role in preventing cancer. β-Carotene has a molecular formula of C40H56, and it contains two rings and no triple bonds. How many double bonds does it have?
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Textbook Question
What is the molecular formula for each of the following?
b. a 10-carbon hydrocarbon with one bond and 2 rings
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Textbook Question
What is each compound's systematic name?
a.
b.
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Textbook Question
Determine the degree of unsaturation for hydrocarbons with the following molecular formulas:
c. C12H20
d. C40H56
1
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