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Question

The correct IUPAC name for the following compound is :


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

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.

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