Why does benzene undergo substitution reactions, but not addition reactions? Add
ID: 951670 • Letter: W
Question
Why does benzene undergo substitution reactions, but not addition reactions? Addition reactions destroy the stable aromatic ring of benzene, while substitution reactions preserve it. Addition to benzene encounters more steric hindrance than substitution. A benzene molecule has three distinct C=C's that are conjugated with each other. This conjugate blocks any addition that tries to occur. Addition reactions form a more unstable cabocation iintermediate than substitution reactions. What is the organic product?Explanation / Answer
Ans:(A)
Benzene is having the 6 pi electons and it is the planar molecule.
The presence of the delocalised electrons makes benzene particularly stable.
Benzene resists addition reactions because that would involve breaking the delocalisation and losing that stability.
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