Answer:
(i) Phenoxide ion
(ii) o-nitrophenoxide ion
(iii) p-nitrophenoxide ion
Due to ?R effect of ?
group, o- and p-nitrophenoxide ions are more stable than phenoxide ion.
Consequently, both o- and p-nitrophenols are more acidic than phenol.
Note Structures in boxes
have negative charge on that C-atom to which electron withdrawing ?
group is attached. So, these structures contribute more towards the acidic
character than the others.
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