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Which of the following is/are INCORRECT IUPAC names?

1. (A) 2-Ethyl-3-methyl pentane
2. (B) 1-amino butane-1-one
3. (C) 3-Methyl pentane
4. (D) 4-(1,1-dimethylethyl)-2-methyl pentane

Correct answer: (A) 2-Ethyl-3-methyl pentane

Solution

In 2-Ethyl-3-methylpentane, the ethyl substituent at C2 can be incorporated into a longer parent chain of 6 carbons. Correct IUPAC name is 2,3-dimethylhexane. This makes option A an incorrect IUPAC name.

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