Question:
Which of the following gives Carbylamine test?
Which of the following gives Carbylamine test?
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Carbylamine test is given only by primary amines, both aliphatic and aromatic. Secondary and tertiary amines do not give this test.
Updated On: Jun 19, 2026
- \(R_2NH\)
- \(RNH_2\)
- \(RNC\)
- \(RCN\)
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The Correct Option is B
Solution and Explanation
Step 1: Understand carbylamine test.
Carbylamine test is a test used to identify primary amines. In this test, a primary amine reacts with chloroform and alcoholic potassium hydroxide to form an isocyanide.
\[ RNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2O \]
Step 2: Check the given options.
\(R_2NH\) is a secondary amine. Secondary amines do not give carbylamine test.
\(RNH_2\) is a primary amine. Primary amines give carbylamine test.
\(RNC\) is an isocyanide product, not the amine that gives the test.
\(RCN\) is a nitrile and does not give carbylamine test.
Step 3: Final conclusion.
Only primary amines give carbylamine test. Therefore, the correct answer is:
\[ \boxed{RNH_2} \]
Carbylamine test is a test used to identify primary amines. In this test, a primary amine reacts with chloroform and alcoholic potassium hydroxide to form an isocyanide.
\[ RNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2O \]
Step 2: Check the given options.
\(R_2NH\) is a secondary amine. Secondary amines do not give carbylamine test.
\(RNH_2\) is a primary amine. Primary amines give carbylamine test.
\(RNC\) is an isocyanide product, not the amine that gives the test.
\(RCN\) is a nitrile and does not give carbylamine test.
Step 3: Final conclusion.
Only primary amines give carbylamine test. Therefore, the correct answer is:
\[ \boxed{RNH_2} \]
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