QQuestionChemistry
QuestionChemistry
The following name is incorrect. Select the correct IUPAC name.
(E)- 1 -isopropyl- 1 -butene
(select)
(3E)- 5,5 -dimethyl- 3 -pentene
(3E)- 5 -methyl- 3 -hexene
(3E)- 1,1 -dimethyl- 2 -pentene
(3E)- 2 -methyl- 3 -hexene
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Analyze the IUPAC naming rules
- In IUPAC nomenclature for alkenes, we need to:
Step 3:
Identify the longest carbon chain
Step 4:
Number the chain to give the double bond the lowest possible number
Step 5:
Specify the geometry of the double bond (E or Z)
Step 6:
List substituents in alphabetical order
Step 7:: Evaluate the given options
- (E)- 1 -isopropyl- 1 -butene: Incorrect naming - (3E)- 5,5 -dimethyl- 3 -pentene: Incorrect naming - (3E)- 5 -methyl- 3 -hexene: Correct IUPAC name - (3E)- 1,1 -dimethyl- 2 -pentene: Incorrect naming - (3E)- 2 -methyl- 3 -hexene: Incorrect naming
Step 8:: Verify the correct name (3E)- 5 -methyl- 3 -hexene
- Longest carbon chain: 6 carbons (hexene) - Double bond at position 3 - E configuration specified - One methyl substituent at position 5 - Follows all IUPAC nomenclature rules
Final Answer
(3E)- 5 -methyl- 3 -hexene
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