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Sodium bisulphite is used to purify alde...

Sodium bisulphite is used to purify aldehydes and ketones. Explain.

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Aldehydes and ketones (except bezophenone) react with a saturated solution of `NaHSO_(3)` to form white crystalline precipitates which are filtered. These are easily decomposed by aqueous `HCl` or NaOH to regenerates these compounds in pure from.
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