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(B) Carbonyl compounds (aldehydes and ketones) form solid crystalline addition products with sodium bisulphite $(NaHSO_3)$.These solid bisulphite addi

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$NaHSO_3$

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(B) Carbonyl compounds (aldehydes and ketones) form solid crystalline addition products with sodium bisulphite $(NaHSO_3)$.These solid bisulphite addition products can be separated from the reaction mixture by filtration,leaving impurities behind.The pure carbonyl compound is then regenerated from the solid addition product by treatment with dilute acid or base.The reaction is as follows:$CH_3CHO + NaHSO_3 \rightarrow CH_3CH(OH)SO_3Na$ (Solid addition product)$CH_3CH(OH)SO_3Na + H_2O \rightarrow CH_3CHO + NaHSO_3$ (Pure aldehyde)

Which one of the following is used for the purification of aldehydes?

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