O- hydroxybenzoic acid is stronger than O- methyl oxy benzoic acid. Why?
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O- hydroxybenzoic acid is stronger than O- methyl oxy benzoic acid. Why?
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So blindly ortho would be most acidic ( due to ortho effect as explained earlier ) now although you didn't asked but i found it quite important to share so what happens at meta is bit deep than comparing at other positions , like I told you that Oh has +R and -I and at meta +R won't show its effect so only -I left which again helps in dispersing the negative charge in other words it is more acidic than benzoic acid but less acidic than ortho one., and finally at para position -I due to its distance dependence is very weak and +R is quite strong so para is least acidic as +R intensifies negative charge.
Result : ortho hydroxy B.acid > meta hydroxy B.acid > benzoic acid > para hydroxy B. acids.
So Answer to your question should be ,
Para is least acidic.