Question

Consider the above reaction sequence and identify the major product P.

• A. Methane
• B. Methanal
• C. Methoxymethane
• D. Methanoic acid

Answer 1

The Correct Option is A

The reaction sequence proceeds as follows:
Step 1: Oxidation with Jones Reagent
Jones reagent (\(\text{CrO}_3 + \text{H}_2\text{SO}_4\)) converts primary alcohols, such as ethanol (\(\text{CH}_3\text{CH}_2\text{OH}\)), into carboxylic acids, specifically acetic acid (\(\text{CH}_3\text{COOH}\)).
\[\text{CH}_3\text{CH}_2\text{OH} \rightarrow [\text{JonesReagent}] \text{CH}_3\text{COOH}.\]
Step 2: Oxidation with \(\text{KMnO}_4\)
Acetic acid (\(\text{CH}_3\text{COOH}\)) is further oxidized by \(\text{KMnO}_4\) to carbonic acid (\(\text{H}_2\text{CO}_3\)), which is unstable and decomposes into \(\text{CO}_2\) and water.
\[\text{CH}_3\text{COOH} \rightarrow [\text{KMnO}_4]\text{H}_2\text{CO}_3 \rightarrow \text{CO}_2 + \text{H}_2\text{O}.\]
Step 3: Decarboxylation with Soda Lime
Carbon dioxide (\(\text{CO}_2\)) undergoes decarboxylation with soda lime (\(\text{NaOH} + \text{CaO}\)) to yield methane (\(\text{CH}_4\)).
\[\text{CO}_2 + \text{NaOH} \rightarrow \text{CH}_4 + \text{Na}_2\text{CO}_3.\]
Final Product:
The primary product \(P\) is methane (\(\text{CH}_4\)).
Final Answer: (1).