What is the major product of Carbylamine reaction?
- Cyanide
- Isocyanide
- Nitrite
- Alkane
The Correct Option is B
Approach Solution - 1
The Carbylamine reaction, also known as the isocyanide test or Hofmann isocyanide synthesis, is an important reaction in organic chemistry used to synthesize isocyanides. In this reaction, a primary amine reacts with chloroform in the presence of a strong base like potassium hydroxide (KOH), leading to the formation of an isocyanide (RNC) as the major product. The reaction can be summarized as follows:
\(RNH_2+CHCl_3+3KOH→RNC+3KCl+3H_2O\)
The products are isocyanide (RNC), potassium chloride (KCl), and water (H2O). The unique and characteristic foul smell of isocyanides makes this reaction a useful qualitative test for primary amines; however, it only works with aliphatic primary amines, not aromatic amines or secondary/tertiary amines.
In conclusion, among the given options, the major product of the Carbylamine reaction is isocyanide.
Approach Solution -2
The Carbylamine reaction involves the reaction of a primary amine (R-NH₂) with chloroform (CHCl₃) in the presence of a strong base (usually KOH). The reaction leads to the formation of an isocyanide (also known as isocyanate or carbylamine).
- Isocyanides (or isocyanates) have the general structure R-N=C, where the nitrogen is directly attached to a carbon atom with a double bond.
In this reaction:
- A primary amine reacts with chloroform (CHCl₃) and KOH, producing an isocyanide or carbylamine as the major product.
Thus, the major product is isocyanide (Option B).
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