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The correct order of the groups – CN(a), –Cl(b), – CF₃ (c) and – NO₂ (d) in increasing the strength of a carboxylic acid, when they are bounded to -carbon of carboxylic acid separately is

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b < d < a < c

a < b < c < d

d < a < b < c

b < a < d < c

answer is C.

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Detailed Solution

Acidic stregth $α$ electron withdrawing nature of the functionsl group (-I effect or -M effect)

-I Effect order : $- C F_{3} > - N O_{2} > - C N > - C l$

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