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What is the IUPAC name of the compound with the structure ?
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Identify the longest continuous carbon chain in the molecule. In this case, the structure CH3-CH2-CH2-CH3 consists of four carbon atoms connected in a straight chain.
Determine the base name of the compound based on the number of carbons in the longest chain. For four carbons, the base name is 'butane'.
Check for any substituents or branches attached to the main chain. Here, there are no branches or substituents; all carbons are connected linearly.
Since the molecule is a straight-chain alkane with no branches, the prefix 'n-' (normal) can be used to indicate this linear structure, resulting in the name 'n-butane'.
Compare the given options with the correct IUPAC name. '2-methylpropane' and 'isobutane' refer to branched isomers, while 'pentane' has five carbons. Therefore, the correct IUPAC name for the given structure is 'n-butane'.