1.

The correct order of acidic strength is :

Answer»

`IIIgtIVgtIgtII`
`IIgtIgtIIIgtIV`
`IIgtIIIgtIgtIV`
`IIgtIgtIVgtIII`

SOLUTION :In compounds `I^(st)`& `II^(nd)` acidity is decided by Intramolecular H-bonding & compound `III^(RD)` acidity is decided by SIR (steric INHIBITION to Resonance)


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