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

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.
Reason R : Phenols react with halogen acids violently.

In the light of the above statements, choose the most appropriate from the options given below:

  1. Both A and R are true but R is NOT the correct explanation of A
  2. A is false but R is true
  3. A is true but R is false
  4. Both A and R are true and R is the correct explanation of A

Solution

Assertion (A): Given statement is correct because in phenol hydroxyl group cannot be replaced by halogen atom. Aryl halides cannot be prepared by replacing hydroxyl group of phenols because the carbon oxygen bond in phenols has a partial double bond character and is difficult to break being stronger than a single bond.

Reason (R):Phenols react with halogen acids violently. Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom. 

Given reason is false

Hence Assertion (A) is correct but Reason (R) is incorrect.

Asked in: JEE Main 2024 (29 Jan Shift 1)

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