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A ketone has molar mass \( 86 . \) Which of the following cannot be IUPAC name of this ketone?

1. 2 -pentanone
2. 2-methyl butanone
3. 3 -methyl butanone
4. 3 -pentanone

Correct answer: 3 -methyl butanone

Solution

The molar mass of 3-methyl butanone exceeds 86, so it cannot be the correct IUPAC name for the ketone.

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