The Carbylamine reaction, also known as the isocyanide test or Hofmann isocyanide synthesis, is a key organic chemistry reaction for producing isocyanides. In this process, a primary amine reacts with chloroform and a strong base, typically potassium hydroxide (KOH), to primarily form an isocyanide (RNC). The reaction equation is:
\(RNH_2+CHCl_3+3KOH→RNC+3KCl+3H_2O\)
The resulting products are isocyanide (RNC), potassium chloride (KCl), and water (H2O). The distinctive, unpleasant odor of isocyanides allows this reaction to serve as a qualitative test for primary amines. However, this test is only effective for aliphatic primary amines, not aromatic, secondary, or tertiary amines.
Therefore, considering the provided options, the principal product of the Carbylamine reaction is isocyanide.