(B) $Cl_2 + H_2O \to 2HCl + [O]$ (Nascent oxygen)$\text{Coloured matter} + [O] \xrightarrow{\text{Bleaching}} \text{Colourless matter}$ (Oxidation)Chl

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(B) $Cl_2 + H_2O \to 2HCl + [O]$ (Nascent oxygen)$\text{Coloured matter} + [O] \xrightarrow{\text{Bleaching}} \text{Colourless matter}$ (Oxidation)Chlorine acts as a bleaching agent only in the presence of moisture because it produces nascent oxygen,which is responsible for the bleaching action.