Question

Convert calcium carbide to oxalic acid

Answer 1

O=CH2−H2C=O would be the logical answer based on the form both elements are being used in

Answer 2

Explanation:

Step 1: Calcium carbide on treating with water gives acetylene.

$CaC_2+H_2O\rightarrow CH\equiv CH$

Step 2: 4 moles of  potassium permanganate reacts with acetylene to give oxalic acid in alkaline medium:

$CH\equiv CH\overset{4KMnO_4/OH^-}\rightarrow (COOH)_2$