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  4. Mark the correct order of decreasing acid strength of the following:

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Q. Mark the correct order of decreasing acid strength of the following:Chemistry Question Image

Solution:

Electron withdrawing group increase acid strength of alcohol
II -Electron with drawing group- $NO _{2}$ at para position impart significant acid strength
IV - NO $_{2}$ Group at Meta position exhibit only-I effect,
III - At Meta position exhibit weak-I effect
I -NO-I effect arid no resonance
$v$ - electron donating group $\left( OCH _{3}\right)$ at Para position decrease acid strength