Question

Given:

The enthalpy of the hydrogenation of these compounds will
be in the order as : [2015]
(a) III > II > I (b) II > III > I
(c) II > I > III (d) I > II > III

Answer 1

.. (I) (II) (III) The enthalpy of the hydrogenation of these compounds will be in the Order as : [ 2015] (a) III» II» I (b) II-III - I (c) II-I-III (d) Is II-III ...

Answer 2

III > II > I is the correct order of enthalpy of hydrogenation.

Explanation:

• Enthalpy of hydrogenation is the heat released by addition of hydrogen to a substance.

• The enthalpy of hydrogenation is achieved by subtracting the energy that is needed to kick the molecule out of stability zone from the heat released due to hydrogenation.

• So the most stable molecule will have the least enthalpy of hydrogenation.

• And the least stable molecule will have most enthalpy of hydrogenation.

• Here the 1st compound has benzene ring in it which is resonance stabilized.

• So it will have least enthalpy of hydrogenation.

• The 3rd molecule do have no stability of resonance.

• So it will have most enthalpy of hydrogenation.

• So the order is III > II > I.

For more information about enthalpy of hydrogenation,

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The enthalpy of hydrogenation of cyclohexene is -119.5 kj/mol. What is the enthalpy of benzene, if its resonance energy is -150.4 kJ/mol?

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The enthalpy of hydrogenation of cyclohexene is -1 19.5 kilo joule per mole and resonance energy of benzene is - 150.4 kilo joule per mole the enthalpy of hydrogenation would be​