Question

A nauseating smell in the carbylamine test for primary amines is due to the formation of
A Isocyanide
B Chloroform
C Cyanide
D DDT

Answer 1

Hint To answer this question, we must first make a hypothesis as to what kind of reaction would take place in which chemical when a heated mixture of chloroform and ethanolic potassium hydroxide. Only after evaluating the substances used or produced during the reaction can we come to the accurate conclusion.

Complete solution step by step
Let's first learn some fundamental ideas about the carboxyl amine reaction before moving on to the answer to the given problem:
A primary amine, chloroform, and base react to make the carboxyl amine reaction, sometimes referred to as the Hofmann isocyanide synthesis, which produces an isocyanide. Dichlorocarbene serves as an intermediary in the conversion.
Mechanism: Chloroform is the first dehydrohalogenation (hydrogen halide is removed from a specific substrate) to produce dichlorocarbene intermediate. This intermediate of the dichlorocarbene is highly reactive. The main amine's nucleophilic nitrogen is attacked by the electrophilic dichlorocarbene. Isonitrile is created as a result of the hydrochloric acid being eliminated. Below is a diagram that shows how the carbylamine reaction works.
\[\text{RN}{{\text{H}}_{\text{2}}}\text{+3KOH+CHC}{{\text{l}}_{\text{3}}}\to \text{RNC+3KCl+3}{{\text{H}}_{\text{2}}}\text{O}\]
The unappealing smell of the isocyanide RNC makes it easy to identify. The carbylamine reaction is the name given to this primary amine reaction.

The right answer is A .

Note The carbylamine reaction can be used as a chemical test for the presence of primary amines because it only works for these substances. The response is often referred to as Saytzeff's isocyanide test in this situation.