91Ó°ÊÓ

An amide is a carboxylic acid derivative that contains amide linkage.

Instead of the \( - OH\) group in \( - COOH\), it has an \( - N{H_2}\) group at its place and is available for forming bonds with alkyl chains.

The first amide structure is propionamide.

Its structure consists of an acyl chain that contains three carbon atoms and an amide group. Nitrogen doesn't share any N-C bonds in this case.

The second amide structure is N-methylacetamide.

Acetamide indicates that it comes from acetic acid, which has 2 carbon atoms, and that instead of COOH, there is an amide group.

Also, N- methyl in the name suggests that there is a methyl group bonded directly to the amide nitrogen atom.

The third amide structure is \(N,N\)-dimethylformamide.

Formamide indicates that it comes from formic acid, which has 1 carbon atom, and that instead of \(COOH\) , there is an amide group.

Also, N,N-dimethyl in the name suggests that there are two methyl groups bonded directly to the amide nitrogen atom.

N,N-dimethylformamide

The fourth isomer is N-ethylformamide.

Its structure is as shown below:

N-ethylformamide