Which of the following acids has the smallest dissociation constant (Ka)?
Answer & explanation
Correct answer: option 3
Out of the four given species,BrCH2CH2COOH is least acidic and has the least dissociation constant (less Ka value). It is because of (i) the lesser -I effct of Br As compared to the F and (ii) Br atom is further away from the -COOH group.