What is the IUPAC name for the following compound?
A) 2,4-dimethyl-2-pentenone
B) 2,5-dimethylcyclopenten-3-one
C) 2,4-dimethylcyclopent-2-enone
D) 3,5-dimethylcyclopent-2-enone
E) 2-methyl-5-methylcyclopent-2-enone

Question

What is the IUPAC name for the following compound? 
A) 2,4-dimethyl-2-pentenone 
B) 2,5-dimethylcyclopenten-3-one 
C) 2,4-dimethylcyclopent-2-enone 
D) 3,5-dimethylcyclopent-2-enone 
E) 2-methyl-5-methylcyclopent-2-enone

Quizplus · Accepted Answer

The compound has a cyclopentenone ring with two methyl substituents at positions 2 and 4. According to IUPAC rules, the ring is numbered to give the lowest possible locants to the substituents, so the name is 2,4-dimethylcyclopent-2-enone.

What Is the IUPAC Name for the Following Compound