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. Which of the following has the small...

.
Which of the following has the smallest `pK_(a)` value?

A

`ClCH_(2)COOH`

B

`C_(6)H_(5)CH_(2)COOH`

C

`CH_(3)CH_(2)COOH`

D

`HOCH_(2)COOH`

Text Solution

Verified by Experts

The correct Answer is:
A
`pK_(a)=-log K_(a)`
Stronger the acid higher its `K_(a)` and lower is its `pK_(a)`. Stronger the -I effect, greater the acidic strength or electron withdrawing power.
`-Cl gt -OH gt -CH_(3)`
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