The IUPAC names of the given compounds are 3-methylpentane, 1,3-butadiene, 1,3-dimethylcyclohexane, 2,3,5,5-tetramethyl-1,3-hexadiene, and 2,2-dimethylpentane respectively.
What are the IUPAC nomenclature rules?
- Find the longest continuous carbon chain. This chain is called a parent chain.
- Identify all the substituents attached to the parent chain.
- Number the carbon atoms from the end which gives the substituents the lowest number.
- If the substituent occurs more than one then the location of each point is given and the number of times the substituent occurs is indicated by a prefix like di, tri, tetra, and so on.
- Double bonds are always given preference. Give the double bond as low a number as possible.
- If there are two chains of equal lengths then choose the chain that has
- greatest numbers of side chains
- chain whose substituents have the lowest number
- having least branched side chains
- A cyclic (ring) hydrocarbon is represented by the prefix cyclo- which appears in front of the base name.
Thus, following the IUPAC nomenclature rules the name of the given compounds are as follows:
3-methylpentane
1,3-butadiene
1,3-dimethylcyclohexane
2,3,5,5-tetramethyl-1,3-hexadiene
and 2,2-dimethylpentane
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