In naming amides, substituents connected to nitrogen are prefixed with what?

In the nomenclature of amides, substituents attached to the nitrogen atom are indeed prefixed with "N-." This indicates that the substituent is coming from the nitrogen, distinguishing it from substituents on the carbon backbone of the molecule, which are typically numbered based on their position.

The "N-" prefix is used to clarify that these are substituents on the nitrogen, particularly important when multiple groups may be present. Moreover, these substituents do not receive a position number because the amide itself is considered as the principal functional group, and the nitrogen substituents are simply indicated before the base name of the compound. This method streamlines the naming process and prevents confusion regarding the positions of substituents.

The other options do not reflect standard nomenclature conventions for amides.