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Solution


Q.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Order of acidic nature of the following compounds is A > B > C.

Reason R: Fluoro is a stronger electron withdrawing group than Chloro group.  

In the light of the above statements, choose the correct answer from the options given below:           [2023]
1 A is true but R is false  
2 Both A and R are correct and R is the correct explanation of A  
3 A is false but R is true  
4 Both A and R are correct but R is NOT the correct explanation of A  

Ans.

(4)

Acidic strength ∝– I effect

∝1+I effect

F,Cl exerts –I effect, Methyl exerts +I effect, C is least acidic. Among A and B; since inductive effect is distance dependent, Extent of –I effect is higher in A followed by B even though F is stronger electron withdrawing group than Cl. Thus, A is more acidic than B.