The correct answer is A. R-NH2, R-NC, carbene.
The carbylamine reaction is a chemical reaction in which an alkyl halide reacts with ammonia to form a primary amine and hydrogen halide. The reaction is typically carried out in the presence of a base, such as sodium hydroxide.
The mechanism of the carbylamine reaction is as follows:
- The alkyl halide reacts with the base to form an alkyl carbanion.
- The alkyl carbanion reacts with ammonia to form a carbene.
- The carbene reacts with ammonia to form a primary amine.
The intermediate carbene is a highly reactive species that can exist in two forms: singlet and triplet. The singlet carbene is more stable and is the form that is typically involved in the carbylamine reaction. The triplet carbene is less stable and is more likely to undergo side reactions.
The carbylamine reaction is a versatile reaction that can be used to synthesize a variety of primary amines. The reaction is also used in the production of pharmaceuticals and other chemicals.
Option B is incorrect because the product of the carbylamine reaction is a primary amine, not a nitrene.
Option C is incorrect because the intermediate in the carbylamine reaction is a carbene, not an amine.
Option D is incorrect because the intermediate in the carbylamine reaction is a carbene, not an alcohol.