Ncert Exercises & Solutions

Which of the following is the correct IUPAC name?

1. 3-Ethyl-4,4-dimethylheptane

2. 4,4-Dimethyl-3-ethylheptane

3. 5-Ethyl-4,4-dimethylheptane

4. 4,4-Bis(methyl)-3-ethylheptane

Hint: The longest carbon chain contains seven carbon atoms.

The longest carbon chain contains seven carbon atoms. Thus parent chain is heptane. Numbering of the chain is done in such a way that ethyl group gets lowest position. The compound with numbering is as follows:

The IUPAC name of the compound is 3-Ethyl-4,4-dimethylhexane. Hence option one is the correct answer.
4,4-Dimethyl-3-ethylheptane is wrong because alphabetically ethyl will come first than methyl.

5-Ethyl-4,4-dimethylheptane is wrong because lowest sum rule doesnot follow while numbering the chain.

4,4-Bis(methyl)-3-ethylheptane is wrong because bis is not used.

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