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Dinesh khalmaniya 1
SIR effect is due to steric hindrance of bulky group at ortho position. due to steric hindrance group goes to out of plane and we know that Resonance effect works only in planae so in this case resonance do not work so less resonance is present. basicity increase due to more resonance due to SIR effect . in short SIR effect increase the basicity of aniline and decrease the acidity of phenol.