Verified Solution • 2025–26 Session moderate

QJEEM23Ch869e: JEE Main 2023 Chemistry - Class 12 JEEM23Ch869e Solution: Given below are two statements, one is labelled as Assertion A…

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.

JEE Main 2023 (Online) 13th April Evening Shift Chemistry - Alcohols, Phenols and Ethers Question 43 English

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:

Multiple Choice Options

  • A Both A and R are correct but R is NOT the correct explanation of A
  • B A is false but R is true
  • C A is true but R is false
  • D Both A and R are correct and R is the correct explanation of A

Step-by-Step Verified Solution

Acidic strength α−I\alpha-\mathrm{I} effect

α1+I effect 

F,Cl\mathrm{F}, \mathrm{Cl} exerts −I-\mathrm{I} effect, Methyl exerts +I+\mathrm{I} effect, C\mathrm{C} is least acidic.

Among A\mathrm{A} and B\mathrm{B} ; since inductive effect is distance dependent, Extent of −I-\mathrm{I} effect is higher in A\mathrm{A} followed by B\mathrm{B} even though F\mathrm{F} is stronger electron withdrawing group than Cl\mathrm{Cl} . Thus, A\mathrm{A} is more acidic than B\mathrm{B} .

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