Which one of the following pairs of reactants does not form oxygen when they react with each other?

Which one of the following pairs of reactants does not form oxygen when they react with each other?
  1. $\mathrm{F}_2, \mathrm{NaOH}$ solution (hot, conc.)
  2. $\mathrm{F}_2, \mathrm{H}_2 \mathrm{O}$
  3. $\mathrm{Cl}_2, \mathrm{NaOH}$ solution (cold, dilute)
  4. $\mathrm{CaOCl}_2, \mathrm{H}_2 \mathrm{SO}_4$ (dilute, small amount)

Solution

$\mathrm{Cl}_2+\underset{\text { cold, dil }}{2 \mathrm{NaOH}} \longrightarrow \mathrm{NaCl}+\mathrm{NaClO}+\mathrm{H}_2 \mathrm{O}$ Chlorine react with cold and dilute NaOH to give sodium hypochlorite.

Asked in: AP EAMCET 2005

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