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Sodium bisulphite is used for the purifi...

Sodium bisulphite is used for the purification of aldehydes and ketones. Explain.

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All aldehydes and only methyl ketones react with sodium bisulphite, `NaHSO_(4)` to give addition products which are crystalizing and water soluble.

These addition products can easily be decomposed back to give original aldehyde or ketone with dilute mineral acid or aqueous alkali.

Therefore, the reaction can be used in the purification and separation of aldehydes and methyl ketones from other compounds.
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BETTER CHOICE PUBLICATION-ORGANIC COMPOUND WITH FUNCTIONAL GROUP CONTANING OXYGEN-II-Question Bank (12. 3 Physical Properties )
  1. Arrange the following compounds in the increasing order of their boili...

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  2. Aldehydes have lower boiling points than the corresponding alcohols. E...

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  3. Sodium bisulphite is used for the purification of aldehydes and ketone...

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  4. Write Clemmensen reduction.

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  5. Carbonyl compounds mainly show nucleophilic addition. reactions. Why?

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  6. Aldehydes are more reactive than Ketones. Explain.

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  7. Formaldehyde is more reactive than other aldehydes.Justify.

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  8. Give aldol condensation reaction of acetaldehyde and explain why forma...

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  9. Write Aldol condensation reaction.

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  10. Write cross aldol condensation.

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  11. Write cross aldol condensation.

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  12. Write Claisen condensation.

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  13. Aldehydes can be used to make ethyl acetate. Write chemical equation. ...

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  14. How acetaldehyde can be used to ethyl acetate ?

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  15. Benzaldehyde does not undergo Aldol condensation. Give reason only.

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  16. What are Kolbe’s Reaction ? Give one example.

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  17. How will you distinguish between : CH(3)CHO (acetaldehyde or propana...

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  18. How will youdistinguish between benzaldehyde andacetaldehyde?

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  19. Write short note on Cannizzaro's reaction.

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  20. Write short note on Wolf-Kishner reaction.

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