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Identify A in the following reaction. A 2H2 / Pt gives fused bicyclic saturated hydrocarbon; A KMnO4 gives a cyclohexane ring bearing two COOH groups and a separate HOOC-COOH fragment.

1. (1) fused bicyclic compound with double bonds in both rings
2. (2) fused bicyclic compound with one double bond in left ring
3. (3) fused bicyclic compound with one double bond in right ring
4. (4) fused bicyclic compound with one double bond in left ring

Correct answer: (3) fused bicyclic compound with one double bond in right ring

Solution

The correct option describes a fused bicyclic compound that, upon hydrogenation, results in a saturated hydrocarbon, and the subsequent oxidation with KMnO4 leads to the formation of a cyclohexane ring with two carboxylic acid groups. This indicates that the original compound must have a specific double bond configuration that allows for these transformations.

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