Textbook Question
Which of the following cycloalkanes are capable of geometric (cis-trans) isomerism? Draw the cis and trans isomers.
b. 1-ethyl-3-methylcycloheptane
900
views
Ch.3 - Structure and Stereochemistry of Alkanes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
Not the one you use?Change textbookSelect a different textbook
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 3, Problem 17c
Which of the following cycloalkanes are capable of geometric (cis-trans) isomerism? Draw the cis and trans isomers.
c. 1-ethyl-3-methylcyclopentane
Verified step by step guidance1
Step 1: Understand the concept of geometric (cis-trans) isomerism. Geometric isomerism occurs in cycloalkanes when there are two substituents on different carbon atoms of the ring, and these substituents can be positioned either on the same side (cis) or opposite sides (trans) of the ring.
Step 2: Analyze the structure of 1-ethyl-3-methylcyclopentane. This compound has a cyclopentane ring with an ethyl group attached to the first carbon and a methyl group attached to the third carbon.
Step 3: Determine if the substituents allow for cis-trans isomerism. For geometric isomerism to occur, the substituents must be on different carbons and not adjacent to each other, allowing for different spatial arrangements.
Step 4: Draw the cis isomer. In the cis isomer, both the ethyl and methyl groups are on the same side of the cyclopentane ring. Visualize or sketch the cyclopentane ring with both substituents pointing in the same direction.
Step 5: Draw the trans isomer. In the trans isomer, the ethyl and methyl groups are on opposite sides of the cyclopentane ring. Visualize or sketch the cyclopentane ring with one substituent pointing up and the other pointing down.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
2mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Geometric Isomerism
Geometric isomerism, also known as cis-trans isomerism, occurs in compounds with restricted rotation around a bond, typically due to a ring structure or double bond. In cycloalkanes, this isomerism arises when substituents are positioned differently relative to the plane of the ring, leading to distinct cis (same side) and trans (opposite side) configurations.
Recommended video:
Guided course
06:47
Monosaccharides - D and L Isomerism
Cycloalkanes
Cycloalkanes are saturated hydrocarbons with carbon atoms arranged in a ring structure. The ring can impose steric constraints that affect the spatial arrangement of substituents, making geometric isomerism possible if the ring is large enough to accommodate different spatial orientations of substituents without excessive strain.
Recommended video:
Guided course
01:11How to find the root name for cycloalkanes
Substituent Positioning
In cycloalkanes, the positioning of substituents is crucial for determining the possibility of geometric isomerism. For 1-ethyl-3-methylcyclopentane, the substituents at different positions on the ring can lead to cis and trans configurations, depending on whether they are on the same or opposite sides of the ring plane, affecting the molecule's physical and chemical properties.
Recommended video:
4:06Reactions at the Allylic Position Example 3
Related Practice
Textbook Question
Draw the structure that corresponds with each name.
k. cyclobutylcyclohexane
l. cis-1-bromo-3-chlorocyclohexane
1679
views
1
rank
Textbook Question
The heat of combustion of cis-1,2-dimethylcyclopropane is larger than that of the trans isomer. Which isomer is more stable? Use drawings to explain this difference in stability.
788
views
Textbook Question
trans-1,2-Dimethylcyclobutane is more stable than cis-1,2-dimethylcyclobutane, but cis-1,3-dimethylcyclobutane is more stable than trans-1,3-dimethylcyclobutane. Use drawings to explain these observations.
2588
views
Textbook Question
Which of the following cycloalkanes are capable of geometric (cis-trans) isomerism? Draw the cis and trans isomers.
a. 3-ethyl-1,1-dimethylcyclohexane
1146
views
Textbook Question
The cyclohexane chair shown in Figure 3-22 has the headrest to the right and the footrest to the left. Draw a cyclohexane chair with its axial and equatorial bonds, showing the headrest to the left and the footrest to the right.
828
views