Textbook Question
Which of the following alkenes are E and which are Z?
(b)
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4. Alkanes and Cycloalkanes
Cis vs Trans
2:46 minutesProblem 15b
Textbook Question
Name the following alkenes.
(b) 
Verified step by step guidance1
Step 1: Identify the longest continuous carbon chain that contains the double bond. This will serve as the parent chain and determine the base name of the alkene.
Step 2: Number the carbon atoms in the parent chain starting from the end closest to the double bond. This ensures the double bond gets the lowest possible number.
Step 3: Locate the position of the double bond and include its number in the name. For example, if the double bond starts at carbon 2, the name will include '2-ene'.
Step 4: Identify and name any substituents (side groups) attached to the parent chain. Use prefixes like 'methyl-', 'ethyl-', etc., and assign their positions based on the numbering of the parent chain.
Step 5: Combine the substituent names, the position of the double bond, and the parent chain name into the final IUPAC name, ensuring proper alphabetical order for substituents and correct placement of numbers.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alkenes
Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C). They are unsaturated compounds, meaning they have fewer hydrogen atoms than alkanes, which are saturated. The presence of the double bond gives alkenes unique reactivity and isomerism, making them important in organic synthesis and industrial applications.
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Nomenclature
Nomenclature in organic chemistry refers to the systematic naming of chemical compounds based on established rules. For alkenes, the IUPAC naming convention involves identifying the longest carbon chain containing the double bond, numbering the chain to give the double bond the lowest possible number, and using suffixes like '-ene' to indicate the presence of the double bond.
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Geometric Isomerism
Geometric isomerism, also known as cis-trans isomerism, occurs in alkenes due to the restricted rotation around the carbon-carbon double bond. This leads to different spatial arrangements of substituents attached to the double-bonded carbons. Understanding geometric isomerism is crucial for naming alkenes accurately, as it affects their physical and chemical properties.
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