Answer:
[tex]Cl_2CHCO_2H[/tex]
Explanation:
pKa is defined as the negative logarithm of Ka.
Thus,
pKa = -log Ka
Thus, larger the value of Ka, smaller is the value of pKa.
Given that:-
[tex]Cl_2CHCO_2H[/tex] has a pKa = 1.3
[tex]HCO_2H[/tex] has a pKa = 3.8
Thus, lower value of pKa has the larger Ka which is [tex]Cl_2CHCO_2H[/tex], dichloroacetic acid ( 1.3 < 3.8 ) .
