Acetaldehyde is purified by which method when prepared by alcohol in laboratory:
Correct answer: C. Re-distillation.
- A. Solidification.
- B. Chromatography.
- C. Re-distillation.
- D. Steam distillation.
Explanation
The answer is: Re-distillation. During the oxidation of ethanol to get an acetaldehyde, acetaldehyde is immediately distilled off to avoid its oxidation. This distillate (mixture of ethanol, water and acetaldehyde) is then condensed. To get pure acetaldehyde, it is re-distilled.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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