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F is more electro negative than Cl . Bcz –I effect of F is greater than Cl ..... To phir , p-fluoro phenol should be more acidic than p-chloro phenol. But the actual order is reversed . This reversed behavior arises due to the delocalization of negative charge of oxygen atom in both compound Lekin....In case of p-chloro phenol , the negative charge on oxygen atom delocalized to the vacant d-orbital of - Cl atom present in the para-position . But this is not possible for p-fluoro phenol . Bcz -F atom has no vacant d-orbital . Thus the conjugate base of p-chloro phenol is more stable than p-fluoro phenol . To phir..... p-chloro phenol more acidic than p-fluoro phenol .