Textbook Question
Draw the condensed structural or line-angle formula if cyclic, for each of the following:
c. 2,3-dichloro-1-butene
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13. Alkenes, Alkynes, and Aromatic Compounds
Naming Alkenes
Multiple Choice
Provide systematic name for given alkene.
A
trans-2,7-dimethyl-3-octene
B
2,7-dimethyl-3-octane
C
trans-2,7-dimethyl-5-octene
D
2,7-dimethyl-5-octane
Verified step by step guidance1
Identify the longest carbon chain that contains the double bond. In this structure, the longest chain has 8 carbon atoms, making it an octene.
Number the carbon chain starting from the end nearest to the double bond. This ensures the double bond gets the lowest possible number. In this case, the double bond starts at carbon 3.
Identify and name the substituents attached to the main carbon chain. Here, there are methyl groups attached to carbons 2 and 7.
Determine the stereochemistry of the double bond. Since the higher priority groups (based on atomic number) on each carbon of the double bond are on opposite sides, it is a trans configuration.
Combine the information to write the systematic name: trans-2,7-dimethyl-3-octene.
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