JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si256
The compound shown does not give the carbylamine test. Select all of the structures shown that give a foul-smelling isocyanide on warming with CHClX3 and alcoholic KOH.
AStructure A
BStructure B
CStructure C
DStructure D
Answer: B, D
The carbylamine reaction needs a primary amine (−NHX2 on carbon). B (aniline) and D (isopropylamine) are primary amines. A is secondary, and C is an amide whose nitrogen is not a free amine, so neither gives the test.