Which of the following reactions occurs at measurable rate ?

Reaction between ${\mathrm{H}}^{+} \mathrm{and} {\mathrm{OH}}^{-}$ ions in aqueous solution

Reaction between hydrogen and oxygen gases at room temperature

Hydrolysis of methyl acetate

Reaction between ${\mathrm{AgNO}}_{3 }\mathrm{and} \mathrm{NaCl}$ aqueous solutions