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

a.  R—NC
b.  CHCl3
c.  COCl2
d.  NaNO2 + HCl

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Carbylamine reaction Amine on reaction with a mixture of CHuCl3 and KOH produces alkyl isocyanate. RNH2+CHCl3+3KOHRNC+3KCl+3H2O
Only RNC and CHuCl3 are involved in carbylamine reaction. Hence, (a) and (b) are correct.