In which of the following reactions does the rate constant have the unit $mol\,L^{-1}\,s^{-1}$?

Question

$2\,NO_{(g)} + O_{2(g)} \rightarrow 2\,NO_{2(g)}$

Decomposition of HI on the surface of gold

Acid-catalyzed hydrolysis of $CH_3COOCH_3$

$CHCl_3 + Cl_2 \rightarrow CCl_4 + HCl$

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