Please explain this

Dear student,

The naming of the ester group is such that the alkyl group attached to the oxygen of the carboxylic carbon is considered to be the substituent and the alkyl group attached to the carbon of the carboxylic group along with the carboxylic group is parent.
The parent and the substituent is numbered separately.
The parent is named as alkanoate, by replacing 'e' of alkane with 'ote'.
Since in the parent chain, there is a presence of the carbonyl group, the oxygen if the carbonyl carbon will be called as 'oxo'.
Substituent is named before the parent.
Therefore, the name of the given ester is,
Ethyl-(2-oxo) propanoate

Regards

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