Question

What is the reaction of acetaldehyde with concentrated sulphuric acid?

• A. No reaction
• B. Decomposition
• C. Charred to black residue
• D. Polymerisation

Hint:

Concentrated sulfuric acid is a strong dehydrating agent and often leads to carbonization of organic compounds like acetaldehyde.

Answer 1

The Correct Option is C

Step 1: Understand the reaction with concentrated H\(_2\)SO\(_4\). Acetaldehyde, when reacted with concentrated sulfuric acid, undergoes dehydration and polymerization, ultimately forming a black residue.
Step 2: Conclusion. Thus, acetaldehyde is charred to a black residue when treated with concentrated sulfuric acid.