Question

What is the IUPAC name of acetophenone?

Answer 1

Hint: We know that the IUPAC nomenclature is the standardized name which is given to the organic compound using some standard set of rules. Conversely, the common names are the older names which are not official but can be used in order to memorize the molecule and its structure easily.

Complete answer:
Acetophenone is an organic compound with molecular formula $ {{C}_{6}}{{H}_{5}}COC{{H}_{3}} $ . It is the simplest aromatic ketone which is structurally represented as follows:
 

As it is clear from the structure that the given molecule consists of a ketone functional group. So, IUPAC nomenclature rules to name a compound with a ketonic group are as follows:
1. Ketones are always named from their parent alkane chains but the suffix -e is replaced with the suffix -one.
2. The chain numbering will always start from the nearest end of the carbonyl group no matter whether the carbonyl group is located with a chain or a ring.
3. In the IUPAC system, the aromatic ketones are considered as benzene substituted aliphatic ketones and thus, are named accordingly.
Therefore, the numbering of the chain in the given molecule will be as follows:

Thus, the IUPAC name of the given molecule i.e. Acetophenone is 1-phenylethanone.

Note:
It is important to note that if there are more than one functional group present in a molecule, then the functional group with higher priority is named first and other groups are considered as substituents. If in case, both the ketone and aldehyde group is present in a molecule, then the aldehyde group is given priority over the ketonic group.