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What is the correct order of increasing ...

What is the correct order of increasing acidic strength of the following?

A

`III lt I lt IV lt II `

B

`III lt IV lt II lt I `

C

`III lt II lt IV lt I`

D

`III lt IV lt I lt II`

Text Solution

Verified by Experts

Usually H bonded to a carbon atom is less acidic than the one bonded to an electronegative atom. However, I has very high acidic strength, equivalent to a strong inorganic acid because of aromaticity in conjugate base and five very strong electron withdrawing `CF_3` groups.

Although IV forms aromatic anion on deprotonation, this alone does not makes it stronger acid than phenol but ofcourse it is stronger acid than III.
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