Chlorine water on standing loses its color and forms:

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Chlorine water loses it's yellow color on standing in sunlight because it forms mixture of hypochlorous acid $(HOCl)$ and hydrochloric acid $(HCl)$ .
$C l_{2} (g)$ Is soluble in $H_{2} O$ and form chlorine water, in presence of sunlight as

$C l_{2} (g) + H_{2} O \to H C l + H O C l$
This is a disproportionation reaction., where chlorine changes it's oxidation state from zero in ${Cl}_{2}$ to -1 in $HCl$ and +1 in $HOCl$ . Hypochlorous acid formed in this reaction gives nascent oxygen which is responsible for bleaching action

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