Textbook Question
Draw the structure and give the molecular formula for each of the following compounds.
a. 1-ethyl-3-methylcycloheptane
b. isobutylcyclohexane
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4. Alkanes and Cycloalkanes
Naming Cycloalkanes
6:04 minutesProblem 70c
Textbook Question
Draw skeletal structures for the following:
c. 2,3,3,4-tetramethylheptane
Verified step by step guidance1
Step 1: Understand the name of the compound. The name '2,3,3,4-tetramethylheptane' indicates that the parent chain is 'heptane,' which consists of 7 carbon atoms in a straight chain.
Step 2: Identify the substituents. The prefix 'tetramethyl' means there are four methyl groups (-CH₃) attached to the parent chain. Their positions are specified as 2, 3, 3, and 4.
Step 3: Begin by drawing the parent chain. Create a straight chain of 7 carbon atoms, representing the heptane backbone.
Step 4: Add the substituents. Attach a methyl group (-CH₃) to the second carbon, two methyl groups to the third carbon (making it a branched structure), and one methyl group to the fourth carbon.
Step 5: Verify the structure. Ensure that all carbons have four bonds (following the octet rule) and confirm that the naming matches the structure. The skeletal structure should show the main chain and substituents clearly.
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Video duration:
6mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Skeletal Structures
Skeletal structures, or line-angle formulas, are simplified representations of organic molecules where carbon atoms are implied at the ends of lines and at intersections. Hydrogen atoms attached to carbons are usually omitted for clarity. This notation allows chemists to visualize the molecular framework without cluttering the diagram with every atom, making it easier to identify functional groups and branching.
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IUPAC Nomenclature
IUPAC nomenclature is a systematic method for naming organic chemical compounds. It provides a set of rules to derive the name of a compound based on its structure, including the longest carbon chain, the presence of substituents, and their positions. Understanding IUPAC naming conventions is essential for interpreting compound names and translating them into accurate skeletal structures.
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Tertiary and Quaternary Carbons
In organic chemistry, tertiary (3°) and quaternary (4°) carbons refer to carbon atoms that are bonded to three or four other carbon atoms, respectively. These types of carbons are significant in understanding the branching and stability of alkanes. In the case of 2,3,3,4-tetramethylheptane, recognizing the positions and types of these carbons is crucial for accurately drawing its skeletal structure.
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