The enthalpy of hydrogenation of cyclohexene is $-119.5 kJ mol ^{-1} .$ If resonance energy of benzene is $-150.4 kJ mol ^{-1}$, its enthalpy of hydrogenation would be:-
- $-508.9\,KJ\,mol^{-1}$
- $-2.8.1\,Kj\,mol^{-1}$
- $-269.9\,KJ\,mol^{-1}$
- $-358.5\,Kj\,mol^{-1}$
The Correct Option is B
Solution and Explanation
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Concepts Used:
Aromatic hydrocarbon
Aromatic hydrocarbons, sometimes known as arenes, are aromatic organic molecules made up entirely of carbon and hydrogen. In aromatic compounds a benzene ring which is named after the simple aromatic chemical benzene, or a phenyl group when part of a larger structure, is the configuration of six carbon atoms.
Read More: Aromaticity
Reactions of Aromatic Hydrocarbons:
1. Aromatic Substitution Reactions
This reaction involves the replacement of one substituent on the ring of an aromatic hydrocarbon, commonly a hydrogen atom, by a different substituent group.
The common types of aromatic substitution reactions are:
- Nucleophilic aromatic substitution reactions
- Electrophilic aromatic substitution reactions
- Radical nucleophilic aromatic substitution reactions
2. Coupling Reactions
In these types of reactions, the coupling of two fragments that have a radical nature is achieved with the help of a metal catalyst