Among the following four compounds the acidity order is :
(i) Phenol
(ii) Methyl phenol
(iii) Meta-nitrophenol
(iv) Para-nitrophenol
Text Solution
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In phenols, the presence of electron releasing groups decreases the acidity, whereas presence of electron withdrawing groups increase the acidity, compared to phenol. Among the meta and para-nitrophenols, the latter is more acidic as the present of – NO 2 group at para position stabilises the phenoxide ion to a greater extent than when it is present at meta position. Thus, correct order of acidity is :
Para-nitrophenol > meta-nitrophenol > phenol > methyl phenol
(iv) (iii) (i) (ii)
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