Question:

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

Updated On: Jul 12, 2022

$iii < ii < i < iv$
$ii < iv < iii < i$
$ii < iii < iv < i$
$ii < iii < i < iv$

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The Correct Option is C

Solution and Explanation

m-cresol has an electron releasing group (CH). 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.

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Concepts Used:

Alcohols, Phenols, and Ethers

Alcohol is formed when a saturated carbon atom bonds to a hydroxyl (-OH) group. It is an organic compound that contains a hydroxyl functional group attached to a carbon atom.

Phenol is formed when the -OH group replaces the hydrogen atom in benzene. It is an organic compound in which a hydroxyl group directly attaches to an aromatic hydrocarbon.

Ether is formed when oxygen atom bonds to two alkyl or aryl groups. It is an organic compound that has an oxygen atom that is connected to two aryl and alkyl groups.

Read More: Alcohol, Phenol, and Ethers