Q. The IUPAC name of CH₃CH₂–CH(CH₃)–CH(CH₃)–COCl is :
A) 3, 4-dimethylpentanoyl chloride
B) 1-chloro-1-oxo-2, 3-dimethylpentane
C) 2-ethyl-3-methylbutanoyl chloride
D) 2, 3-dimethylpentanoyl chloride
Explanation
[Solution from source] The principal chain includes the –COCl carbon and has five carbons; numbering starts from that carbon (C-1). Methyl groups sit on C-2 and C-3, so the name is 2,3-dimethylpentanoyl chloride. Numbering from the other end, or choosing a four-carbon chain with an ethyl branch, breaks the IUPAC rules. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.