The electron withdrawing groups decreases the acidic nature and The electron releasing groups increases the acidic nature.
TheF&\mathrm{Cl} are electron withdrawing while CH3 is electron loosing hence acidic strength will be

On further differentiation the–I effect depends on most importantly over distance hence.

The F has higher –I effect as compared to Cl hence reason is correct statement but the –I effect depends more on distance as compared to power hence
is stronger acid than 
