Question

A ketone has molar mass 86. Which of the following cannot be `IUPAC ` name of this ketone ?
A. `2-`pentanone
B. `2-`methyl butanone
C. `3-`Methyl butanone
D. `3-`pentanone

Answer 1

Correct Answer - b
All other `(a),(b)` and `(c)` are correct `IUPAC` names and have molar mass of 86. Although, `(d)` has miolar mass 86, the name is incorrect as per `IUPAC` convention`:`

`2-`methyl butanone `(` wrong `IUPAC` name `)`
`3-`methuyl butanone `(` correct `IUPAC ` name `)`