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For the following acids underset("(I)"...

For the following acids
`underset("(I)")((CH_(3))_(3)C CH_(2)CO_(2)H)" "underset(("II"))overset(oplus" ")((CH_(3))_(3)NCH_(2)CO_(2)H)" "underset((III))(CH_(3)COOH)`
`pK_(a)` value will be in order

A

`I gt II gt III`

B

`I lt II lt III`

C

`I gt III gt II`

D

`II gt III gt I`

Text Solution

Verified by Experts

The correct Answer is:
C
EWG increases acidic strength (-1,-M). EDG decreases acidic strength
I. `CH_3 -underset(CH_3)underset(|)overset(CH_3)overset(|)C - CH_2 - COO^(-)` II. `CH_3 - underset(CH_3)underset(|)overset(CH_3)overset(|)N^(o+) - CH_2 - COO^(-)` III. `CH_3 - overset(O)overset(||)C -O^(-)`
`pK_a prop 1/K_a and K_a prop` Stability of carboxylate ion.
Stability of ion is `II gt III gt I rArr K_a IIgt III gt I rArr pK_a II lt III lt I`
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