Question

What is the IUPAC name of the following compound?

(a) 6-(2-oxocyclohexyl)-hexan-3-one

(b) 2-(3-oxopentyl)-cyclohexan-1-one

(c) 2-(4-oxopentyl)-cyclohexan-1-one

(d) 5-(2-oxocyclohexyl)-hexan-3-one

I had been asked this question during an interview.

This interesting question is from Nomenclature and Structure of Carbonyl Groups in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Answer 1

Correct choice is (b) 2-(3-oxopentyl)-cyclohexan-1-one

The best explanation: The cyclic ketone is considered as the main group with the 3-oxopentyl keto group substituted at alpha carbon.