1.

Among the following four compounds (i) phenol (ii) methylphenol (iii) meta-nitrophenol (iv) para-nitrophenol the acidity order is

Answer»

(iv)gt(iii)gt(i)gt(ii)
(iii)gt(iv)gt(i)gt(ii)
(i)gt(iv)gt(iii)gt(ii)
(ii)gt(i)gt(iiii)gt(iv)

Solution :In substituted PHENOLS, presence of ELECTRON withdrawing groups INCREASES the acidity whereas presence of electron releasing groups decreases the acidity as compared to phenol. Further, among the meta and p-nitrophenols, para is more acidic as the presence of `-NO_(2)` group at p-position stabiolizes the phenoxide ion to a greater extent tthan when it is present at the m-position. HENCE, the correct order of acidity is:
p-nitrophenol (iv)gt m-nitrophenol (iii)gtphenol (i) gtmethylphenol (ii) i.e., option (a) is correct.


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