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The correct increasing order of the acid...

The correct increasing order of the acid strength of benzoic acid (I),4-nitrobenzoic acid (II),3,4-dinitrobenzoic acid (III) and 4-methoxybenzoic acid (IV) is

A

`I lt II lt III lt IV`

B

`II lt I lt IV lt III`

C

`IV lt I lt II lt III`

D

`IV lt II lt I lt III`

Text Solution

Verified by Experts

The correct Answer is:
C
Electron-donating groups decrease while electron-withdrawing groups increase the acidity of carboxylic acids. Further, larger the number of electron-withdrawing groups, more is the acidity. Thus, 3,4-dinitrobenzoic acid (III) is more acidic than 4-nitrobenzoic acid (II) and both tare more acidic than benzoic acid (I). 4-Methoxybenzoic acid (IV) is however, the weakest acid. thus, correct increasing order of acid strength is:
`IV lt I lt II lt III`, i.e, option (c) is correct.
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Knowledge Check

  • The correct increasing order of acidic strength is

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