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Sodium Bisulphite is used for the purification of aldehydes and Ketones. Explain.

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Sodium Bisulphite is used for the purification of aldehydes and Ketones. Explain.  

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Aldehydes and Ketones form addition compounds with NaHSO3 whereas impurities do not. 

On hydrolysis we get pure aldehydes and Ketones back. 

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