Assertion A: Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.

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Q.
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: [2024]

1 A is false but R is true

2 Both A and R are true and R is the correct explanation of A

3 A is true but R is false

4 Both A and R are true but R is NOT the correct explanation of A

Ans.
(3)

Due to resonance, there is partial double bond character in O-H bond of phenol. This makes the O-H bond difficult to break. Hence it does not react with halogen acids to give aryl halides.

Solution

1 A is false but R is true

2 Both A and R are true and R is the correct explanation of A

3 A is true but R is false

4 Both A and R are true but R is NOT the correct explanation of A

Ans.
(3)

Due to resonance, there is partial double bond character in O-H bond of phenol. This makes the O-H bond difficult to break. Hence it does not react with halogen acids to give aryl halides.

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Solution

1 A is false but R is true

2 Both A and R are true and R is the correct explanation of A

3 A is true but R is false

4 Both A and R are true but R is NOT the correct explanation of A

Ans. (3) Due to resonance, there is partial double bond character in O-H bond of phenol. This makes the O-H bond difficult to break. Hence it does not react with halogen acids to give aryl halides.

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Ans.
(3)

Due to resonance, there is partial double bond character in O-H bond of phenol. This makes the O-H bond difficult to break. Hence it does not react with halogen acids to give aryl halides.