Question

What is the IUPAC name of Methyl n-propyl ketone​?

• A. Pentan-2-one
• B. Butan-2-one
• C. Pentan-3-one
• D. 2-Methylpentan-2-one

Answer 1

The correct option is A Pentan-2-one

Methyl n-propyl ketone​ is the common name whose structure is
$C{H}_{3}COC{H}_{2}C{H}_{2}C{H}_3.$
The numbering to the parent chain can be done as shown below:
The functional group is ketone so suffix used for this is 'one'
parent chain is of five carbon so word root is Pent. Hence IUPAC name of Methyl n-propyl ketone​ is Pentan-2-one.