Carbylamine Test
Carbylamine test gives foul smell indicating presence of:
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More halogen organics Practice Questions
Carbylamine test requires chloroform and alcoholic KOH; characteristic product is:
Carbylamine test requires chloroform and alcoholic KOH; characteristic product is:
2-Bromobutane undergoes SN1 to give racemic mixture because:
2-Bromobutane undergoes SN1 to give racemic mixture because:
Sandmeyer reaction converts anilines to aryl bromides via intermediate:
Sandmeyer reaction converts anilines to aryl bromides via intermediate:
Chloroform stored with ethanol forms phosgene slowly; ethanol is added to:
Chloroform stored with ethanol forms phosgene slowly; ethanol is added to:
Best leaving group among given (in SN1):
Best leaving group among given (in SN1):
Formation of Grignard reagent fails in presence of:
Formation of Grignard reagent fails in presence of:
Strong bulky base (t-BuOK) acting on 2-bromobutane favors formation of:
Strong bulky base (t-BuOK) acting on 2-bromobutane favors formation of:
SN1 rate law for tert-butyl bromide in aqueous ethanol depends on:
SN1 rate law for tert-butyl bromide in aqueous ethanol depends on:
Benzylic bromides undergo SN1 faster than alkyl bromides due to:
Benzylic bromides undergo SN1 faster than alkyl bromides due to:
Chlorobenzene is less reactive than alkyl chloride in nucleophilic substitution because:
Chlorobenzene is less reactive than alkyl chloride in nucleophilic substitution because:
Elimination-addition (benzyne) mechanism is favored by treatment of chlorobenzene with:
Elimination-addition (benzyne) mechanism is favored by treatment of chlorobenzene with:
Finkelstein reaction converts R–Cl to R–I using NaI in acetone because:
Finkelstein reaction converts R–Cl to R–I using NaI in acetone because:
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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