Thank you for reporting, we will resolve it shortly
Q.
A positive carbylamine test is given by
NTA AbhyasNTA Abhyas 2022
Solution:
A positive carbylamine test is given by the primary amines, here in the given options only $2,4-$ dimethylaniline is the primary amine so, only this amine will give the carbylamine test.
In this test, primary amines react with the chloroform in presence of basic $KOH$ solution and isocyanide is formed.