Which of the following reaction is used in the purification of aldehydes from other organic compounds?

Addition of

N a H S O_{3}

to aldehydes

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Addition of

H C N

to aldehydes

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Addition of grignard's reagent to aldehydes

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None of the above

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Solution

The correct option is A Addition of $N a H S O_{3}$ to aldehydes
$N a H S O_{3}$ addition to carbonyl compound is an example of nucleophilic addition reaction.
Mechanism of addition of $N a H S O_{3}$ involves 2 steps.
Step-1:Nucleophilic attack on carbonyl carbon:

Step-2: Formation of an adductSince, the reaction is reversible, addition product can be converted back into carbonyl compounds using mineral acids. This method can be used for the purification of aldehydes from other organic compounds.

Therefore, the correct answer is option (a).

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