Final answer:
An N-substituted imine, or Schiff base, is a compound where a nitrogen atom is substituted for one or more hydrogen atoms in an imine functional group. The correct option in this case is a) Amine.
Step-by-step explanation:
An N-substituted imine, also known as a Schiff base, is a compound where a nitrogen atom (N) is substituted for one or more hydrogen atoms in an imine functional group. The correct option in this case is a) Amine. Amines are organic compounds that can be considered as derivatives of ammonia, where one or more hydrogen atoms are replaced by hydrocarbon groups. In the case of an N-substituted imine, the hydrocarbon group is attached to the nitrogen atom of the imine functional group.