Q1 / 180 · COMEDK 2026 (9 May Shift 1) · Chemistry
The reagent used in carbylamine reaction is ----------------------- and the product of the reaction will be ---------------
- ABenzene sulphonyl chloride ; sulphonamide
- BConcentrated $\text{HCl} + \text{NaNO}_2$ ; diazonium salt
- Correct answerCAlcoholic $\text{KOH} + \text{CHCl}_3$ ; isocyanide
- DAlcoholic $\text{KOH} + \text{CHCl}_3$ ; cyanide
Solution
The carbylamine reaction is a characteristic test for primary amines (both aliphatic and aromatic).
When a primary amine is heated with chloroform ($\text{CHCl}_3$) and alcoholic potassium hydroxide ($\text{KOH}$), it forms an isocyanide (also known as carbylamine), which has a characteristic foul smell.
The general reaction is:
$R-\text{NH}_2 + \text{CHCl}_3 + 3\text{KOH (alc.)} \xrightarrow{\Delta} R-\text{NC} + 3\text{KCl} + 3\text{H}_2\text{O}$
Thus, the reagent used is alcoholic $\text{KOH} + \text{CHCl}_3$ and the product is an isocyanide.
Answer: Alcoholic $\text{KOH} + \text{CHCl}_3$ ; isocyanide
When a primary amine is heated with chloroform ($\text{CHCl}_3$) and alcoholic potassium hydroxide ($\text{KOH}$), it forms an isocyanide (also known as carbylamine), which has a characteristic foul smell.
The general reaction is:
$R-\text{NH}_2 + \text{CHCl}_3 + 3\text{KOH (alc.)} \xrightarrow{\Delta} R-\text{NC} + 3\text{KCl} + 3\text{H}_2\text{O}$
Thus, the reagent used is alcoholic $\text{KOH} + \text{CHCl}_3$ and the product is an isocyanide.
Answer: Alcoholic $\text{KOH} + \text{CHCl}_3$ ; isocyanide
Hence, the correct answer is option: 'C'.