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Q.

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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a

b < d < a < c 

b

a < b < c < d

c

d < a < b < c

d

b < a < d < c

answer is C.

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Detailed Solution

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

-I Effect order :  -CF3  >-NO2  >-CN>- Cl  

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