why phenol OH group is not replaced when reacted with halogens
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Because phenol doesn't undergo nucleophilic substitution reaction.
Reasons are viz,
1. Bond Energy (sp2>sp3)
2.Double bond character between halogen and carbon due to resonance,
which makes it unstable
3.Electronegativity and bond strength (sp2>sp3)
4. Stability of Vinylic carbocation<Allylic carbocation
5. Due to repulsion between pi electron cloud and nucleophile.
hope u get it...!
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