Aldehydes combine with alcohol in presence of hydrogen chloride gas to form:
Correct answer: B. Acetal
- A. Alkane
- B. Acetal
- C. Carboxylic acid
- D. Ketones
Explanation
Aldehydes combine with alcohols in the presence of hydrogen chloride gas to form acetals. The hydrogen chloride gas acts as a catalyst. Both the alcohol and the hydrogen chloride gas must be dry. The reaction may be used to protect the aldehyde group against alkaline oxidising agents. To regenerate aldehyde, the acetal is hydrolysed in the presence of an acid.
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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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