$RNH_2 + CHCl_3 + KOH \xrightarrow{\Delta} ?
ext{The product of above reaction is :}$

Q: $RNH_2 + CHCl_3 + KOH \xrightarrow{\Delta} ? \text{The product of above reaction is :}$

$RNH_2 + CHCl_3 + KOH \xrightarrow{\Delta} ? \text{The product of above reaction is :}$

Question

$RNH_2 + CHCl_3 + KOH \xrightarrow{\Delta} ?
	ext{The product of above reaction is :}$

Accepted Answer

The reaction in question is known as the Carbylamine reaction or Hofmann isocyanide synthesis. This reaction involves the treatment of a primary amine (RNH₂) with chloroform (CHCl₃) and a strong base, typically potassium hydroxide (KOH), under heating (Δ). The product of this reaction is an isocyanide, also known as a carbylamine, which is represented by the formula RNC.

1. **Explanation for Option 4 (RNC):**
   - The Carbylamine reaction specifically converts primary amines into isocyanides (RNC) when reacted with chloroform and a strong base like KOH. The mechanism involves the formation of dichlorocarbene (:CCl₂) from chloroform, which then reacts with the primary amine to form the isocyanide. This is a well-documented and characteristic reaction for primary amines, leading to the formation of the isocyanide product, RNC.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (RCl):** This option suggests the formation of an alkyl chloride. However, the reaction conditions and reagents used in the Carbylamine reaction do not facilitate the substitution of the amine group with a chlorine atom. Therefore, RCl is not the product of this reaction.
   - **Option 2 (ROH):** This option suggests the formation of an alcohol. The Carbylamine reaction does not involve any mechanism or pathway that would lead to the formation of an alcohol. The reagents and conditions are not suitable for converting an amine to an alcohol.
   - **Option 3 (RCN):** This option suggests the formation of a nitrile. While nitriles can be formed from amines through different reactions, the Carbylamine reaction specifically leads to the formation of isocyanides, not nitriles. The presence of chloroform and the reaction conditions are not conducive to forming a nitrile in this context.

In conclusion, the Carbylamine reaction is a specific transformation that results in the formation of an isocyanide (RNC) from a primary amine, chloroform, and a strong base. Therefore, Option 4 (RNC) is the correct answer.