The most basic general formula for the amide is: rnco rhcn rconh2 nanh2

Option (c) is the correct answer.

Explanation:

An organic compound that contains the functional group "" is known as an amide.

General chemical formula of an amide is , where R can be alkyl or aryl group.

For example, is a primary amide whose name is ethanamide.

A compound that contains a functional group "-NCO" is known as an isocyanate group.

And, "-CN" functional group is known as cyanate group.

is a compound called sodamide and it is a specific formula.

Hence, we can conclude that the most basic general formula for the amide is .