Identify A in the following reaction.

Step 1: Catalytic Hydrogenation (H₂ / Pt)

• Product formed is a fully saturated fused bicyclic compound (decalin)
• This means all double bonds in A are reduced
• Since 2H₂ are used, A must contain two double bonds
• The fused ring structure indicates both double bonds are within the ring system

Step 2: Oxidation with hot KMnO₄ (Δ)

• Hot KMnO₄ cleaves double bonds
• Products given:
  • One cyclohexane ring with two -COOH groups
  • One oxalic acid (HOOC-COOH)
• Formation of oxalic acid indicates a double bond between two carbons each having H
• This confirms both double bonds are present in the same ring, arranged such that cleavage gives oxalic acid