Question:
Among the following amines, the one which will give carbylamine test is
Among the following amines, the one which will give carbylamine test is
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Carbylamine test is given only by primary amines:
\[
1^\circ \text{ amines } \rightarrow \text{Positive}
\]
\[
2^\circ \text{ and } 3^\circ \text{ amines } \rightarrow \text{Negative}
\]
Updated On: Jun 10, 2026
- Trimethylamine
- Dimethylamine
- Aniline
- Triethylamine
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The Correct Option is C
Solution and Explanation
Concept:
The carbylamine test is a characteristic test for primary amines.
When a primary amine is heated with chloroform and alcoholic potassium hydroxide, an isocyanide (carbylamine) having a foul smell is produced.
\[
RNH_2 + CHCl_3 + 3KOH
\rightarrow
RNC + 3KCl + 3H_2O
\]
Only primary amines respond positively to this test.
Secondary and tertiary amines do not give the carbylamine reaction.
Step 1: Examine Trimethylamine \[ (CH_3)_3N \] It is a tertiary amine. Hence it does not give the test.
Step 2: Examine Dimethylamine \[ (CH_3)_2NH \] It is a secondary amine. Hence it does not give the test.
Step 3: Examine Aniline \[ C_6H_5NH_2 \] Aniline is a primary aromatic amine. Therefore it gives the carbylamine reaction. \[ C_6H_5NH_2 + CHCl_3 + 3KOH \rightarrow C_6H_5NC + 3KCl + 3H_2O \] Hence it gives a positive test.
Step 4: Examine Triethylamine \[ (C_2H_5)_3N \] It is a tertiary amine. Hence it does not respond to the test.
Final Answer Only aniline gives the carbylamine test. \[ \boxed{\text{Option (C)}} \]
Step 1: Examine Trimethylamine \[ (CH_3)_3N \] It is a tertiary amine. Hence it does not give the test.
Step 2: Examine Dimethylamine \[ (CH_3)_2NH \] It is a secondary amine. Hence it does not give the test.
Step 3: Examine Aniline \[ C_6H_5NH_2 \] Aniline is a primary aromatic amine. Therefore it gives the carbylamine reaction. \[ C_6H_5NH_2 + CHCl_3 + 3KOH \rightarrow C_6H_5NC + 3KCl + 3H_2O \] Hence it gives a positive test.
Step 4: Examine Triethylamine \[ (C_2H_5)_3N \] It is a tertiary amine. Hence it does not respond to the test.
Final Answer Only aniline gives the carbylamine test. \[ \boxed{\text{Option (C)}} \]
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