Question

Which of the following species are involved in the carbylamine test?

(i) \[\ce{R - NC}\]

(ii) \[\ce{CHCl3}\]

(iii) \[\ce{COCl2}\]

(iv) \[\ce{NaNO2 + HCl}\]

Answer 1

(i) \[\ce{R - NC}\]

(ii) \[\ce{CHCl3}\]

Explanation:

Carbylamine reaction: Amine on reaction with a mixture of \[\ce{CHCl3}\] and \[\ce{KOH}\] produces alkyl isocyanate.

\[\ce{R-NH2 + CHCl, + 3KOH ->[Heat] RNC + 3KCl + 3H2O}\] Only \[\ce{RNC}\] and \[\ce{CHCl3}\] are involved in carbylamine reaction.