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  4. The correct increasing order of the acid strength of acids, butyric acid (I), 2 - chlorobutyric acid (II), 3 - chlorobutyric acid (III) and 2, 2 - dichlorobutyric acid (IV) is

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Q. The correct increasing order of the acid strength of acids, butyric acid $(I), 2$ - chlorobutyric acid $(II), 3 $ - chlorobutyric acid $(III)$ and $2, 2$ - dichlorobutyric acid $(IV)$ is

KEAMKEAM 2017Aldehydes Ketones and Carboxylic Acids

Solution:

(c) Among the acids

(i) Butyric acid

(ii) $2$-chlorobutyric acid

(iii) $3$-chlorobutyric acid

(iv) $2$-dichlorobutyric acid The acidic strength increases on.

(i) Presence of electron with drawing group. (i.e. $-I$ group)

(ii) Closeness of electron withdrawing group from the $- COOH$ groups.

(iii) Number of electron with drawing groups. (i.e. $-I$ group $)$

Hence, the correct order will be

$I < III < II < IV$