Q12 / 90 · JEE Main 2023 (13 Apr Shift 2) · Chemistry

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.

Figure

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 :

 

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

Solution

The electron withdrawing groups decreases the acidic nature and The electron releasing groups increases the acidic nature.

The F & Cl are electron withdrawing while CH3 is electron loosing hence acidic strength will be

Figure

On further differentiation the– I effect depends on most importantly over distance hence.

Figure

The F has higher –I effect as compared to Cl hence reason is correct statement but the –I effect depends more on distance as compared to power hence Figure is stronger acid than  Figure

Hence, the correct answer is option: 'D'.

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