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What is the IUPAC name of the compound with the following structure: CH3-CH(CH2CH3)-CH(CH2CH3)-CH3?

1. 2,3-diethyl butane
2. 2-ethyl-3-methyl pentane
3. 3-methyl-2-ethyl pentane
4. 3,4-dimethyl hexane

Correct answer: 3,4-dimethyl hexane

Solution

The longest chain is 6 carbons (hexane). The two extra CH3 groups are at positions 3 and 4, giving 3,4-dimethylhexane.

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