Formaldehyde polymerizes to form?
Correct answer: C. Metaformaldehyde
- A. Bakelite
- B. Paraldehyde
- C. Metaformaldehyde
- D. All of these
Explanation
Formaldehyde (CH2O) can undergo polymerization to form metaformaldehyde, which is a cyclic trimer consisting of repeating units of formaldehyde. This compound has the chemical formula (CH2O)3and is a direct result of the polymerization process. In contrast, Bakelite is a synthetic resin derived from phenolic compounds and formaldehyde, but it does not result from the polymerization of formaldehyde alone.Paraldehyde, while related to aldehydes in structure, is a cyclic compound formed from acetaldehyde, not from formaldehyde. Therefore, the only correct answer is metaformaldehyde.
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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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