Question

The reaction, $A + B +C \rightarrow Z$ occurs by the following mechanism
(i) $A + B \rightarrow X $ (fast)
(ii) $X + C \rightarrow Y$ (slow)
(iii) $Y + B \rightarrow Z$ (very fast)
Rate law for this reaction is

• A. $ k[C] $
• B. $ k[A][B]^{2}[C] $
• C. $ k[Z] $
• D. $ k[X][Y][Z] $

Answer 1

Answer: (A)

The slowest step is the rate determining step in the multiple step reaction. So, rate expression is $ k[C] $ .