객관식
Which of the following statements correctly describes the name according to IUPAC nomenclature rules for alkenes and aldehydes?
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4. Alkanes and Cycloalkanes
Naming Alkenes
객관식
Which of the following is the correct IUPAC name for one of the three structural isomers of alkenes with the molecular formula ?
A
2-methyl-2-butene
B
1-pentene
C
cyclopentane
D
2-pentyne
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검증된 단계별 안내1
Identify the molecular formula given: \(C_5H_{10}\). This formula corresponds to either alkenes (with one double bond) or cycloalkanes (with a ring), since both have the general formula \(C_nH_{2n}\).
List the possible types of compounds with this formula: linear or branched alkenes with one double bond, and cycloalkanes with no double bonds.
Analyze each option to determine if it fits the formula and the category of alkenes:
- 2-methyl-2-butene is an alkene with 5 carbons and one double bond.
- 1-pentene is a straight-chain alkene with 5 carbons and one double bond.
- cyclopentane is a cycloalkane, not an alkene.
- 2-pentyne is an alkyne (contains a triple bond), so it does not fit the alkene category.
Recall the IUPAC naming rules for alkenes: the longest chain containing the double bond is numbered to give the double bond the lowest possible number, and substituents are named accordingly.
Compare the options to see which is a correct IUPAC name for an alkene isomer of \(C_5H_{10}\): 1-pentene is the correct IUPAC name for a straight-chain alkene with the double bond starting at carbon 1.
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