Carbylamine Test
Easychemistry
Carbylamine test gives foul smell indicating presence of:
Select the correct option:
Solution
Incorrect! Answer:
Primary amines (aliphatic/aromatic)
- Reactants: Aliphatic or aromatic primary amine, Chloroform (CHCl3), and alcoholic Potassium Hydroxide (KOH).
- Reaction: R−NH2+CHCl3+3KOH→R−NC(Isocyanide)+3KCl+3H2O.
- Observation: The product is an alkyl or aryl isocyanide (carbylamine), which has an extremely offensive and characteristic foul smell.
- Specificity: Secondary and tertiary amines do not have two replaceable hydrogen atoms on the nitrogen and thus do not undergo this reaction. This makes it a diagnostic test for primary amines.
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About This Question
- Subject
- chemistry
- Chapter
- halogen organics
- Topic
- carbylamine test
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Primary amines (aliphatic/aromatic)
- Reactants: Aliphatic or aromatic primary amine, Chloroform (CHCl3), and alcoholic Potassium Hydroxide (KOH).
- Reaction: R−NH2+CHCl3+3KOH→R−NC(Isocyanide)+3KCl+3H2O.
- Observation: The product is an alkyl or aryl isocyanide (carbylamine), which has an extremely offensive and characteristic foul smell.
- Specificity: Secondary and tertiary amines do not have two replaceable hydrogen atoms on the nitrogen and thus do not undergo this reaction. This makes it a diagnostic test for primary amines.
This easy difficulty chemistry question is from the chapter halogen organics, covering the topic of carbylamine test. It appeared in the 2025 exam.
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