In the given pair identify most acidic compound in (A) and (B). Most basic in (C) and (D).

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Acidity increases with electron withdrawing group. Ortho effect increases acidity. Basicity increases with electron donating group. Ortho effect decreases basicity.
So. in case of

(Ortho effect)
in case of B most acidic is

in case of C most basic is

in case of D most basic is
