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Multiple Choice
In IUPAC naming, what does the prefix of an organic compound's name indicate?
A
The number of carbon atoms in the longest chain
B
The type of functional group present
C
The stereochemistry of the compound
D
The position of the functional group
Verified step by step guidance
1
Understand that the IUPAC naming system is a standardized method for naming organic chemical compounds.
Recognize that the prefix in an IUPAC name often indicates the number of carbon atoms in the longest continuous chain of the compound. For example, 'meth-' for one carbon, 'eth-' for two carbons, 'prop-' for three carbons, and so on.
Note that the prefix can also provide information about substituents or branches attached to the main carbon chain, such as 'methyl-' for a CH₃ group or 'ethyl-' for a C₂H₅ group.
Consider that while the prefix primarily indicates the number of carbon atoms, it does not directly indicate the type of functional group present, the stereochemistry, or the position of the functional group. These aspects are usually indicated by other parts of the IUPAC name, such as suffixes or locants.
Review examples of IUPAC names to see how prefixes are used in practice, and practice identifying the longest carbon chain and any substituents to become familiar with the naming conventions.