Which acid of each pair shown here would you expect to be stronger?
Electron withdrawing groups increase the acidity of carboxylic acids by stabilising the conjugate base. Fluroine is more electronegtive than methyl group.
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Which acid of each pair shown here would you expect to be stronger? CH2FCOOH or CH2ClCOOH
Fluroine is more electronegtive than chlorine and therefore it is more stronger acid CH2FCOOH.