Bleaching should not be used for acidic water as it reacts with them to:

liberate hydrogen gas

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liberate free chlorine

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form chlorine water

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liberates carbon monoxide

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Solution

The correct option is A liberate free chlorine
Bleaching should not be used for acidic water as it reacts with them to liberate $C l_{2}$ gas. The bleaching action of chlorine is due to liberation of nascent hydrogen gas.
$C l_{2} + H_{2} O ⇌ 2 H C l + [O]$
When water is acidic, the above equilibrium shifts in reverse direction and $C l_{2}$ gas is liberated.
Hence, the option $(B)$ is the correct answer.

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