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The enthalpy of the hydrogenation of these compounds will be in the order as:

1. III > II > I
2. II > III > I
3. I > II > III
4. I > III > II

Correct answer: III > II > I

Solution

The enthalpy of hydrogenation is inversely proportional to the stability of the compound. Compound III is least stable, followed by II, and I is the most stable, leading to the order III > II > I.

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