Question

Which of the following is a solid trimer of formaldehyde?

• A. Metaldehyde
• B. Paraformaldehyde
• C. Paraldehyde
• D. Trioxane

Hint:

Trioxane is a cyclic trimer, whereas paraformaldehyde is a polymeric form of formaldehyde.

Answer 1

The Correct Option is D

Step 1: Polymerisation behavior of formaldehyde.
Formaldehyde undergoes polymerisation reactions to form different products depending on the conditions.

Step 2: Identification of trimers.
Trioxane is the cyclic trimer of formaldehyde formed by acid-catalysed polymerisation and exists as a solid compound.

Step 3: Elimination of other options.
Metaldehyde and paraldehyde are polymers of acetaldehyde, while paraformaldehyde is a long-chain polymer of formaldehyde, not a trimer.

Step 4: Conclusion.
Hence, the solid trimer of formaldehyde is Trioxane.