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Heat of Formation

64 The correc...

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64 The correct decreasing order of magnitude of enthalpy of hydrogenation is And on what factor enthalpy of hydrogenation depends upon

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Q. What is the decreasing order of enthalpy of hydrogenation of the following compounds?

Q. The enthalpy of hydrogenation for

1 - p e n t e n e

+ 126 k J / m o l

. The enthalpy of hydrogenation for

1, 3 - p e n t a d i e n e

+ 230 k J / m o l

. Hence estimate the resonance magnitude of (delocalization) energy of

1, 3 - p e n t a d i e n e

.

Q. The enthalpy of hydrogenation of cyclohexene is

- 119.5 kJ/ mol

. If resonance energy of benzene is

- 150.4 kJ/mol

then what is its enthalpy of hydrogenation?

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

Q. Arrange the following alkene in increasing order of their enthalpy of hydrogenation

(- Δ H)

:

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Heat of Formation

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