MCQ
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 $A > B > C$.

$image$

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

Answer

Correct option: C.
Both $A$ and $R$ are correct but $R$ is NOT the correct explanation of $A$
c
Acidic strength $\alpha-$ I effect

$\alpha \frac{1}{+ I }$ 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 $B$.

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