Published by:
CGP EDU Academic Team
Published on: August 14, 2026
What will be the order of reaction given below ?
NH 4 CNO ⎯→ NH 2 CONH 2
The reaction is completed in three steps as :
(i) NH 4 CNO 
NH 4 NCO (fast equilibrium)
(ii) NH 4 NCO 
NH 3 + H–N=C=O (fast equilibrium) (iii) NH 3 + H–N=C=O ⎯→ NH 2 CONH 2 (slow)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Sol. The rate of formation of urea is given by eq. (iii)
…..
By step (ii) we have : 
…..
By step (i) we have : 
..…
∴ By eqs. and
[NH 3 ] [HNCO] = 
..…
∴ By eqs. and
= K' [NH 4 CNO]
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