Answer: Option (c) is the correct answer.
Explanation:
An organic compound that contains the functional group "[tex]-CONH_{2}[/tex]" is known as an amide.
General chemical formula of an amide is [tex]RCONH_{2}[/tex], where R can be alkyl or aryl group.
For example, [tex]CH_{3}CH_{2}CONH_{2}[/tex] 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.
[tex]NaNH_{2}[/tex] 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 [tex]RCONH_{2}[/tex].
