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Multiple Choice
What is the IUPAC name for the molecule with the structure ?
A
Butane
B
Propane
C
2-Methylpropane
D
Pentane
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Verified step by step guidance
1
Identify the number of carbon atoms in the longest continuous chain of the molecule. The given structure is CH\_3-CH\_2-CH\_2-CH\_3, which has four carbon atoms connected in a straight chain.
Determine if there are any branches or substituents attached to the main carbon chain. In this structure, there are no branches or additional groups attached; it is a straight chain.
Recall the IUPAC nomenclature for alkanes: the prefix indicates the number of carbons, and the suffix '-ane' indicates single bonds. For four carbons, the prefix is 'but-'.
Combine the prefix and suffix to name the molecule. Since it is a straight-chain alkane with four carbons and no branches, the name is 'butane'.
Verify that the other options do not fit the structure: 'propane' has three carbons, '2-methylpropane' has a branched chain, and 'pentane' has five carbons, so these are incorrect.