Textbook Question
Which compound is more stable: cis-1-ethyl-2-methylcyclohexane or trans-1-ethyl-2-methylcyclohexane?
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Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure
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. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and StructureProblem 48d,e,f
Bruice 8th EditionCh. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and StructureProblem 48d,e,fChapter 4, Problem 48d,e,f
Is each of the following a cis isomer or a trans isomer?
d. 
e. 
f. 
Verified step by step guidance1
Step 1: Analyze the first structure (d). Identify the substituents on the cyclohexane ring. The bromine (Br) and methyl (CH3) groups are on adjacent carbons. Determine their relative positions (above or below the plane of the ring). If both substituents are on the same side of the ring (either both above or both below), it is a cis isomer. If they are on opposite sides, it is a trans isomer.
Step 2: Analyze the second structure (e). Identify the substituents on the cyclohexane ring. The chlorine (Cl) and methyl (CH3) groups are on adjacent carbons. Determine their relative positions (above or below the plane of the ring). If both substituents are on the same side of the ring (either both above or both below), it is a cis isomer. If they are on opposite sides, it is a trans isomer.
Step 3: Analyze the third structure (f). Identify the substituents on the cyclohexane ring. The two methyl (CH3) groups are on adjacent carbons. Determine their relative positions (above or below the plane of the ring). If both substituents are on the same side of the ring (either both above or both below), it is a cis isomer. If they are on opposite sides, it is a trans isomer.
Step 4: Use the wedge and dash notation in the structures to determine the spatial orientation of the substituents. A wedge indicates a substituent is above the plane of the ring, while a dash indicates it is below the plane of the ring.
Step 5: Based on the spatial orientation of the substituents in each structure, classify each as either cis or trans. Remember, cis isomers have substituents on the same side of the ring, while trans isomers have substituents on opposite sides.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cis-Trans Isomerism
Cis-trans isomerism, also known as geometric isomerism, occurs in compounds with restricted rotation around a double bond or a ring structure. In cis isomers, substituents are on the same side of the double bond or ring, while in trans isomers, they are on opposite sides. This spatial arrangement can significantly affect the physical and chemical properties of the molecules.
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Is the following cyclohexane cis or trans?
Identification of Isomers
To determine whether a compound is a cis or trans isomer, one must analyze the arrangement of substituents around the double bond or ring. This involves identifying the priority of the groups attached to the carbons involved in the double bond, using the Cahn-Ingold-Prelog priority rules. The configuration can then be classified based on the relative positions of these groups.
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Impact of Isomerism on Properties
Cis and trans isomers can exhibit different physical properties, such as boiling points, melting points, and solubility. For example, cis isomers often have higher boiling points due to increased polarity, while trans isomers may be more stable and have lower boiling points. Understanding these differences is crucial for predicting the behavior of these compounds in chemical reactions and applications.
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Related Practice
Textbook Question
Is each of the following a cis isomer or a trans isomer?
a,
b.
c.
Textbook Question
Draw the more stable chair conformer of cis-1-ethyl-2-methylcyclohexane.
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Textbook Question
The chair conformer of fluorocyclohexane is 0.25 kcal/mol more stable when the fluoro substituent is in an equatorial position than when it is in an axial position. How much more stable is the anti conformer than a gauche conformer of 1-fluoropropane, considering rotation about the C1−C2 bond?
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Textbook Question
Using the data in Table 3.9, calculate the percentage of molecules of cyclohexanol that have the OH group in an equatorial position at 25 °C.
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Textbook Question
Which has a higher percentage of the diequatorial-substituted conformer compared with the diaxialsubstituted conformer: trans-1,4-dimethylcyclohexane or cis-1-tert-butyl-3-methylcyclohexane?
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