Why do 2^ and 3^ amines fail to undergo the carbylamine test?

MHT CET Chemistry question

Why do and amines fail to undergo the carbylamine test?

(A)They combine with chloroform to give a stable compound
(B)They react with alcoholic KOH
(C)The nitrogen atom of the amine group does not have the required number of hydrogen atomsCorrect
(D)All the given reasons are correct

Answer: (C)

Solution

The carbylamine reaction needs an amine with two N-H bonds, since both hydrogens are lost (together with the CHCl3 chlorine atoms) to form the isocyanide R-N=C; 2° amines have one and 3° amines have no N-H hydrogen on

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Question ID VK-082440