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a
NC-CH2-COOH
b
O2N-CH2-COOH
c
F3C-CH2-COOH
d
CH3-CH2-COOH
answer is C.
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Detailed Solution
EWG increases the acidic strength;;In all the above compounds only inductive effect is operating,-I effect of -CF3>-NO2>-CN; EDG decreases the acidic strength -CH3 group shows +I effect, it decreses the acidic strength; Acidic strength of 3>2>1>Acetic acid>4