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What is Steric Inhibition of Deprotonation effect ? Or SID effect ?

We know that picric acid is weak acid than expected this is fact that when picric acid releases a proton it becomes an anion for which repulsion results between oxygen atoms of phenoxide ion and oxygen of nitrate group, commonly known as Steric Inhibition of Deprotonation (SID effect). This also results in slight unstability of phenoxide ion and also decrease acidity. Thus picric acid is a weak acid than expected ever.

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