Question

Given:

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

• A. II > I > III
• B. I > II > III
• C. III > II > I
• D. II > III > I

Answer 1

The correct option is C

III > II > I

Enthalpy of hydrogenation $\propto$ 1/Stability of Compund. The stability of the given compounds can be given as:
I > II > III
So, heat of hydrogenation order will be:
III > II > I