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(D) Chloroform $(CHCl_3)$ is slowly oxidized by air in the presence of light to form an extremely poisonous gas,carbonyl chloride,also known as phosge

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Both $(B)$ and $(C)$

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(D) Chloroform $(CHCl_3)$ is slowly oxidized by air in the presence of light to form an extremely poisonous gas,carbonyl chloride,also known as phosgene $(COCl_2)$.$2CHCl_3 + O_2 \xrightarrow{light} 2COCl_2 + 2HCl$To prevent this,a small amount of ethanol $(1\%)$ is added to the bottle.Ethanol acts as a stabilizer by reacting with any phosgene formed to convert it into non-poisonous diethyl carbonate.$COCl_2 + 2C_2H_5OH \rightarrow (C_2H_5O)_2CO + 2HCl$Additionally,ethanol also helps in slowing down the oxidation process of chloroform.

$A$ small amount of alcohol is added to a bottle of $CHCl_3$ because .............

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