A) phenol > o-nitrophenol > m-nitrophenol > p-nitrophenol
B) p-nitrophenol > m-nitrophenol > o-nitrophenol > phenol
C) p-nitrophenol > o-nitrophenol > m-nitrophenol > phenol
D) o-nitrophenol > m-nitrophenol > p-nitrophenol > phenol
Correct Answer: C
Solution :
Nitrophenol is more acidic than phenol because\[-N{{O}_{2}}\]group is electron withdrawing group and it stabilises the phenoxide ion. The effect is more significant when the substituent is present in o- or p- position than m-position to the\[-OH\]group. Further due to intramolecular hydrogen bonding the acidic strength of o-isomer is weaker than para-isomer. Thus, acidic strength decreases as: p-nitrophenol > o-nitrophenol > m-nitrophenol > phenol
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