Methylamine on treatment with chloroform and ethanolic caustic alkali gives foul smelling compound, the compound is

Alkyl ethylamine is heated with chloroform and alcoholic KOH, a compound with offensive smell is formed. This compound is :

An organic compound 'A' having molecular formula C_(2)H_(3)N on reduction gave another compound 'B' Upon treatment with nitrous acid, 'B' gave ethyl alcohol on warming with chloroform and alcoholic KOH, it formed an offensive smelling compound 'C'. The compound 'C' is :

Boron nitride on reacting with caustic alkali gives:

When aniline is heated with chloroform and alcoholic KOH, a foul smelling product is formed. It is :