During preparation of Acetaldehyde from ethanol in laboratory, why acetaldehyde is distilled off quickly after formation?
Correct answer: C. To avoid further oxidation to acetic acid.
- A. To avoid decomposition of product.
- B. To avoid reduction.
- C. To avoid further oxidation to acetic acid.
- D. None of these.
Explanation
Correct option is C.Acetaldehyde is distilled off quickly after formation in the laboratory to avoid further oxidation to acetic acid. Acetaldehyde is a relatively unstable molecule and can easily be oxidized to acetic acid. Acetic acid is a more stable molecule and is less likely to decompose.If acetaldehyde is not distilled off quickly, it will be oxidized to acetic acid. This can be prevented by using a reducing agent, such as sodium sulfite, to prevent the oxidation. However, this is not always practical, so it is often easier to simply distill off the acetaldehyde as soon as it is formed.
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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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