Question

The correct IUPAC name of $HOC{H}_2(C{H}_2{)}_{3}C{H}_{2}COC{H}_3$ is:

• A. 2-oxoheptan-7-ol
• B. 2-oxoheptanol
• C. 3-hydroxyheptan-2-one
• D. 7-hydroxyheptan-2-one

Answer 1

The correct option is D 7-hydroxyheptan-2-one

By IUPAC rules,
1. Principle functional group must be included in the longest continuous carbon chain. Thus, ketonic group should be in the carbon chain.
2. As priority of -OH is less than -CO, -OH is considered as substituent and numbering should start from -CO.
Thus, we have -OH at $7^{th}$ carbon and ketonic group at 2nd position.
Thus, the IUPAC of given compound is
7-hydroxyheptan-2-one
$HO-H_2\stackrel{7}{C}-\stackrel{6}{C}{H}_2-\stackrel{5}{C}{H}_2-\stackrel{4}{C}{H}_2-\stackrel{3}{C}{H}_2-\stackrel{2}{C}-\stackrel{1}{CO}{H}_3$