What is the strongest acid among the following?

b. (Cl)CH2COOH
c. (Cl)2CHCOOH
d. (Cl)3CCOOH

isnt it the most electronegative if the oxygens are the same?

The strength of an organic acid depends on the degree of ionization. The chloride end attracts protons, pulling them off of adjcent molecules(or actually reducting the bond strength). So, the trichloroacetic acids is the strongest. You can compare pKa here..the smaller pKa, stronger the acid.

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