Question

The correct order of increasing acidic strength of the following compounds is:
a) $C{H}_{3}COOH$
b) $C{H}_{3}OC{H}_{2}COOH$
c) $C{F}_{3}COOH$

• A. $a<b<c$
• B. $b<c<a$
• C. $b<a<c$
• D. $a<c<b$

Answer 1

Answer: (A)

The following compounds are given:

$a)$ $C{H}_{3}COOH$

$b)$ $C{H}_{3}OC{H}_{2}COOH$

$c)$ $C{F}_{3}COOH$

The acidic strength of acetic acid is lower than that of $2$-methoxy acetic acid as the methoxy group is an electron withdrawing group and stabilizes the carboxylate anion.

The acid strength of $2$-methoxyacetic acid is lower than that of trifluoroacetic acid as the methoxy group has less electron withdrawing power than trifluoromethyl group.

Hence, the correct order of increasing acid strength is $a<b<c$.

Option A is correct.