Chemistry · Nomenclature (Trivial and IUPAC)

A ketone has molar mass Which of the following cannot be IUPAC name of this keto

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

Step-by-step solution

The ketone with molar mass 86 corresponds to C5H10O. Option B, "2-methyl butanone," implies a methyl substituent on the carbonyl carbon (C2) of butanone, which is impossible because the carbonyl carbon cannot have four bonds. Thus, it cannot be a valid IUPAC name.
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