Give the name of the line structure below.

Is the given compound an ester, a carboxylic acid, or an amide? Also, draw its condensed and line-angle structures.

Draw the structure for the following name:

2-ethylhexanamide

Propose the IUPAC and common names of the given molecule.

Suggest a plausible structure for the given amide:

3-ethylhexanamide

Propose a plausible structure of N,3-diethyl-4-methylhexanamide.