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Sodium bisulphite is used to purify alde...

Sodium bisulphite is used to purify aldehydes and ketones. Explain.

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Aldehydes and ketones (except benzophenone) react with a saturated solution of `NaHSO_(3)` to form white crystalline precipitates which are filtered. These are easily decomposed by aqueous `HCl` or `NaOH` to regenerates these compounds in pure from.
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DINESH PUBLICATION-ALDEHYDES AND KETONES -Additional Important Question
  1. Halogen acids readily combine with alkenes to form addition products b...

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  2. Why does pure HCN fail to react with aldehydes and ketones ?

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  3. Sodium bisulphite is used to purify aldehydes and ketones. Explain.

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  4. Out of benzaldehyde and propionaldehyde, which is mre reactive towards...

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  5. Boiling points of ketones are higher than those of the isomeric aldehy...

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  6. Chloral hydrate is a gem-diol but still stable. How will you account f...

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  7. Ketones are less reactive than aldehydes in the nucleophilic addition ...

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  8. Why does not formaldehyde take part in aldol condensation?

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  9. Why is it necessary to control the pH during the reaction of aldehydes...

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  10. Benzophenone does not react with NaHSO(3). Explain.

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  11. Why does formaldehyde undergo Cannizzaro's reaction while acetaldehyde...

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  12. How wil you convert an alkene into an aldehyde containing one carboon ...

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  13. Outline the synthesis of PhCH(2)CH(2)CHO from benzene, ethylene oxide ...

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  14. How will you bring about the following changes :

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  15. Arrange the following in the order of their incresing reactivity towar...

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  16. Arrange the following compounds in order of increasing reactivity towa...

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  17. Name two reagents which can be used to convert gtC = O to gt CH(2) gro...

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  18. Which alkene upon reductive ozonolysis will give acetone as the produc...

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  19. Upon ozonolysis, molecule of a hydrcarbon produces of ethanal and one ...

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  20. Why a benzaldehyde less reactive than acetaldehyde towards nucleophili...

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