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Hydrogenation of unsaturated hydrocarbon...

Hydrogenation of unsaturated hydrocarbons is an exothermic reaction. Due to hyperconjugation and resonance the stability of unsaturated hydrocarbons increases and the increase in stability is more due to resonance. Compound with same number of `pi-`bonds and more stability has lower heat of hydrogenation.
Heat of formation is defined as the energy evolved when a molecule is formed from its atoms. For isomers the more stable compounds has higher heat of formation.
The order of heat of formation of the following molecules is :

A

`IgtIIgtIIIgtIV`

B

`IIgtIIIgtIVgtI`

C

`IVgtIIgtIIIgtI`

D

`IVgtIIIgtIIgtI`

Text Solution

Verified by Experts

The correct Answer is:
C
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Hydrogenation of unsaturated hydrocarbons is an exothermic reaction. Due to hyperconjugation and resonance the stability of unsaturated hydrocarbons increases and the increase in stability is more due to resonance. Compound with same number of pi- bonds and more stability has lower heat of hydrogenation. Heat of formation is defined as the energy evolved when a molecule is formed from its atoms. For isomers the more stable compounds has higher heat of formation. The correct heat of hydrogenation order is : (p) 1,3-Pentadiene (q) 1,3-Butadiene (r) 2,3-Dimethyl-1,3-butadiene (s) Propadiene

A stable compound has……………………….heat of formation.

Unsaturated hydrocarbons show _____ reactions .

The increase in stability and decrease in energy of aromatic compounds is due to

(I) Stability order and (II) heat of hydrogenation orders.

(I) Stability order and (II) heat of hydrogenation orders.

No bond resonance explains the stability of the following :

Stability is more for the intermediate