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Question

In the IUPAC name of following compound, there is something wrong. Find the mistake.
N-Ethyl-6-oxo-5-propylheptanamide


A
Principal functional group is incorrectly chosen
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B
Incorrect prefix for locant is used
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C
Parent chain is incorrectly selected
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D
Locants name is not written in order of priority recommended by IUPAC
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Solution

The correct option is C Parent chain is incorrectly selected
Here, amide group has higher priority than keto group, therefore former is the principal functional group and later is a locant. The longest carbon chain starting from carbon of the amide group would be the parent chain. Hence, in face parent chain has eight carbon as:
Ketones ( >C=O )
Prefix : oxo/keto

Amides (CONH2,CONHR,CONR2)
Suffix: amide/ carboxamide

Parent chain is of eight carbon hence root word is octane.

Correct IUPAC name would be
N-Ethyl-5-(1-oxoethyl)octanamide.

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