An amine X reacts with CHCl₃ and KOH to form CH₃CH₂NC. X is:
Ethylamine (CH₃CH₂NH₂) forms ethyl isocyanide (CH₃CH₂NC) in the carbylamine reaction, as per the PDF’s chemical properties.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Nomenclature, Structure and Preparation - Ammonolysis and Gabriel Synthesis