Question

The correct IUPAC name of the following structure is :

• A. 3-nitroso-2-butanone
• B. 2-nitroso-3-butanone
• C. 3-nitro-2-butanone
• D. 2-nitro-3-butanone

Answer 1

The correct option is A 3-nitroso-2-butanone

Nomenclature :
Nitroso: $(-NO)$
Prefix : Nitroso

Ketone: $\text{(>C=O)}$
Prefix: -oxo, keto
Suffix : -one
Here Ketone is the principal functional group (or has higher priority) and gets a lower number/locant as shown


The IUPAC name is 3-nitroso-2-butanone
or 3-nitrosobutan-2-one