Question

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

• A. I < II < III < IV
• B. III < II < IV < I
• C. I < III < II < IV
• D. III < I < II < IV
• E. IV < III < II < I

Answer 1

Answer: (C)

(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

$I<III<II<IV$