1. Tardigrade
  2. Question
  3. Chemistry
  4. Arrange the following compounds in the increasing order of their acidic strength i. m-nitrophenol ii. m-cresol iii. phenol iv. m-chlorophenol

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Q. Arrange the following compounds in the increasing order of their acidic strength
i. $m$-nitrophenol
ii. $m$-cresol
iii. phenol
iv. $m$-chlorophenol

KCETKCET 2015Alcohols Phenols and Ethers

Solution:

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m-cresol has an electron releasing group (CH3). Hence, it decreases the acidic strength .Both nitro and chloro are having -I-effect. Hence, they show higher acidic strength. But nitro is a stronger -I-group than chloro group. Hence, m-nitro phenol is more acidic than m-chlorophenol.

So increasing order of acidic strength is II < III < IV < I.