Rate law from a mechanism with a slow step

1. A.
   rate of slowest step.
2. B.
   rate of fastest step.
3. C.
   average rate of various steps.
4. D.
   instantaneous rate of fast step.

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1. A.
   $r = k\left\lbrack {NO}_{2}Cl \right\rbrack$
2. B.
   $r = k\left\lbrack {NO}_{2} \right\rbrack\lbrack Cl\rbrack$
3. C.
   $r = k\left\lbrack {NO}_{2} \right\rbrack^{2}$
4. D.
   $r = k\left\lbrack {NO}_{2}Cl \right\rbrack^{2}$

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1. A.
   $r = k[\mathrm{NOBr_2}][\mathrm{NO}]$
2. B.
   $r = k'[\mathrm{NO}]^2[\mathrm{Br_2}]$
3. C.
   $r = k'[\mathrm{NO}][\mathrm{Br_2}]$
4. D.
   $r = k[\mathrm{NO}][\mathrm{Br_2}]^2$

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