Answer:
Since
-I-effect of F is much stronger than that of Cl, therefore, 
is a stronger acid than 
. Further, 
group has a weak
-I-effect though much weaker than those of F and Cl, therefore, 
is a stronger acid than 
but weaker than and . Now is a much stronger acid
than 
because 
ion left after the loss
of a proton is stabilized by resonance but no such stabilization is. possible
for 
ion (obtained after loss
of a proton from ). Thus, the
overall, acidic strength decreases in the order:
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