A ketone has molar mass 86. Which of the following cannot be IUPAC name of this ketone?
A
Pentan-2-one
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B
Pentan-3-one
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C
3-Methylbutanone
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D
2-Methylbutan-2-one
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Solution
The correct option is D 2-Methylbutan-2-one All others (a), (b) and (c) are correct IUPAC names and have molar mass of 86. Although, (d) has molar mass 86, the name is incorrect as per IUPAC convention: