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(B) The carbylamine test (or isocyanide test) is a chemical test for the detection of primary amines. In this reaction,a primary amine is heated with

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$CHCl_3$

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(B) The carbylamine test (or isocyanide test) is a chemical test for the detection of primary amines. In this reaction,a primary amine is heated with chloroform $(CHCl_3)$ and an alcoholic potassium hydroxide $(KOH)$ solution to form an isocyanide (carbylamine),which has a foul,offensive smell. The reaction is: $R-NH_2 + CHCl_3 + 3KOH \rightarrow R-NC + 3KCl + 3H_2O$.

Which of the following reagents gives the carbylamine test when heated with $KOH$ and a primary amine?

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