Which of the following can react with $N a H S O_{3} ?$

C H_{3} C O C H_{3}

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C H_{3} C H O

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H C H O

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All of the above.

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Solution

The correct option is D All of the above.
Sodium hydrogensulphite $(N a H S O_{3})$ adds to aldehydes and ketones to form the addition products. The position of the equilibrium lies largely to the right for most aldehydes and to the left for most ketones due to steric reasons. The hydrogensulphite addition compound is water soluble and can be converted back to the original carbonyl compound by treating it with dilute mineral acid or alkali. Therefore, these are useful for the separation and purification of aldehydes.

So, each compound can react with $N a H S O_{3}$
Option D is correct.

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