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Which of the following acids has the sma...

Which of the following acids has the smallest dissociation constant?

A

`CH_(3)CHFCOOH`

B

`FCH_(2)CH_(2)COOH`

C

`B_(1)CH_(2)CH_(2)COOH`

D

`CH_(3)CHBrCOOH`

Text Solution

Verified by Experts

The correct Answer is:
C
Electorn-withdrawing groups increase the acidic strength. Fluorine is more electorn withdrawing than bromine. Also, the acid in which the halogen is attached farther from the acid group is weaker because -I effect decreases with distance. On this basic of this, `Br(CH_(2))_(2)COOH` is the weakest acid of the given choices.
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