Textbook Question
Use bond-dissociation enthalpies (Table 4-2, p. 167) to calculate values of ΔH° for the following reactions.
a. CH3—CH3 + I2 → CH3CH2I + HI
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Ch.4 - The Study of Chemical Reactions
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 4, Problem 40e,f
Label each hydrogen atom in the following compounds as primary (1°), secondary (2°), or tertiary (3°).
(e) 
(f) 
Verified step by step guidance1
Step 1: Understand the definitions of primary, secondary, and tertiary hydrogen atoms. A primary hydrogen is attached to a primary carbon (a carbon bonded to only one other carbon). A secondary hydrogen is attached to a secondary carbon (a carbon bonded to two other carbons). A tertiary hydrogen is attached to a tertiary carbon (a carbon bonded to three other carbons).
Step 2: Examine the structure of compound e. Identify all the carbon atoms and determine how many other carbon atoms each is bonded to. This will help you classify the hydrogen atoms attached to these carbons.
Step 3: For each carbon atom in compound e, count the number of hydrogen atoms attached to it. Use the definitions from Step 1 to label each hydrogen as primary, secondary, or tertiary based on the type of carbon it is attached to.
Step 4: Repeat the process for compound f. Identify the carbon atoms, determine their connectivity with other carbons, and classify the hydrogen atoms accordingly.
Step 5: Review your labels for both compounds e and f to ensure accuracy. Double-check the connectivity of each carbon atom to confirm the classification of the hydrogen atoms.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hydrogen Atom Classification
In organic chemistry, hydrogen atoms are classified based on the type of carbon atom they are attached to. A primary hydrogen is attached to a primary carbon, which is bonded to only one other carbon. A secondary hydrogen is attached to a secondary carbon, bonded to two other carbons, and a tertiary hydrogen is attached to a tertiary carbon, bonded to three other carbons.
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Understanding the hydrogen isotopes.
Carbon Atom Classification
Carbon atoms are classified as primary, secondary, or tertiary based on the number of other carbon atoms they are directly bonded to. A primary carbon is bonded to one other carbon, a secondary carbon to two, and a tertiary carbon to three. This classification helps in understanding the structure and reactivity of organic molecules.
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Structural Representation of Organic Molecules
Organic molecules are often represented using structural formulas that show the arrangement of atoms and bonds. Understanding these representations is crucial for identifying the types of carbon and hydrogen atoms present. Structural formulas can be depicted as line structures, where vertices represent carbon atoms, and hydrogen atoms are implied unless specified.
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Related Practice
Textbook Question
Use bond-dissociation enthalpies (Table 4-2, p. 167) to calculate values of ΔH° for the following reactions.
c. (CH3)3C—OH + HCl → (CH3)3C—Cl + H2O
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Textbook Question
Label each hydrogen atom in the following compounds as primary (1°), secondary (2°), or tertiary (3°).
(a) CH3CH2CH(CH3)2
(b) (CH3)3CCH2CH3
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Textbook Question
Treatment of tert-butyl alcohol with concentrated HCl gives tert-butyl chloride.
When the concentration of H+ is doubled, the reaction rate doubles. When the concentration of tert-butyl alcohol is tripled, the reaction rate triples. When the chloride ion concentration is quadrupled, however, the reaction rate is unchanged. Write the rate equation for this reaction.
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Textbook Question
Label each hydrogen atom in the following compounds as primary (1°), secondary (2°), or tertiary (3°).
(c) (CH3)2CHCH(CH3)CH2CH3
(d)
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Textbook Question
Use bond-dissociation enthalpies (Table 4-2, p. 167) to calculate values of ΔH° for the following reactions.
b. CH3CH2Cl + HI → CH3CH2I + HCl
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