Structure and Acid Strength (Section 3.4) Which is the stronger acid, chloroethanoic acid (ClCH2CO2H) or bromoethanoic acid (BrCH2CO2H) ? Why? (Relevant end-of-chapter Exercises: 3.17,3.18,3.21,3.22,3.25 ) ClCH2CO2H, because Cl is a more electronegative group than Br, and stabilizes the conjugat base after H+is removed. BrCH2CO2H, because Br is a more electronegative group than Cl, and stabilizes the conjugate base after H+is removed. BrCH2CO2H, because Br is a less electronegative group than Cl, and destabilize the conjugate base after H+is removed. ClCH2CO2H, because Cl is a less electronegative group than B, and destabilize the conjugate base after H+is removed