Question

The correct IUPAC name for the following compound is :

• A. 3-phenylbutan-2-one
• B. 1-phenylbutan-2-one
• C. 2-oxo-benzylbutane
• D. 2-phenylbutan-1-one

Answer 1

The correct option is B 1-phenylbutan-2-one

If an aromatic compound consists of an open and a closed chain, principle chain will be the open chain if it has more than one carbon. Also if a functional group is present in open chain, benzene will act as a substituent. Therefore, the numbering of the given compound can be done as following:

Hence the IUPAC name of the compound is 1-phenylbutan-2-one.