Which of the following is used for purification of aldehydes from impurities?

H C N

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N a H S O_{3}

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C H_{3} M g B r

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N a_{2} S O_{4}

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Solution

The correct option is B $N a H S O_{3}$
When sodium bisulphite is mixed with aldehyde it produces an additional white material which can be easily filtered to remove impurities

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N a_{2} C O_{3} S O_{2} - - \to (A) N a_{2} C O_{3} - ---- \to (B) S \to (C) A g N O_{3} - --- \to (D)

C u

C u

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