Multiple Choice
Given a molecule with the structure with an ethyl group attached to the third carbon, at which position does the IUPAC name indicate the ethyl group is located?
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4. Alkanes and Cycloalkanes
IUPAC Naming
Multiple Choice
What is the IUPAC name of the compound with the structure ?
A
Methane
B
Butane
C
Propane
D
Pentane
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Verified step by step guidance1
Identify the molecular formula of the compound by counting the number of carbon atoms in the longest continuous chain. Here, the structure is CH\_3-CH\_2-CH\_2-CH\_3, which contains 4 carbon atoms.
Recall the IUPAC nomenclature for alkanes, where the prefix indicates the number of carbon atoms: 'meth-' for 1, 'eth-' for 2, 'prop-' for 3, 'but-' for 4, and 'pent-' for 5 carbons.
Since the compound has 4 carbon atoms in a straight chain and contains only single bonds, it is classified as an alkane with the suffix '-ane'.
Combine the prefix for 4 carbons ('but-') with the suffix for alkanes ('-ane') to form the name 'butane'.
Confirm that there are no branches or functional groups that would modify the name, so the correct IUPAC name is simply 'butane'.
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