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Standard XII

Chemistry

Chemical Properties of Phenols

Assertion :Ph...

Question

Assertion :Phenol forms 2,4,6-tribromophenol on treatment with $B r_{2}$ water at 273 K. Reason: Phenol is o,p-directing group.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Phenol forms 2 , 4 , 6-tribromophenol on treatment with $B r_{2}$ -water at 273 K.

In phenols , the polarisation of bromine takes place even in the absence of Lewis acid.

In phenol, hydroxy group is o , p-directing group.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Note: If phenol is treated with bromine at low temperature in a solvent, such as carbon disulphide or chloroform, a mixture of o-bromophenol and p-bromophenol is obtained. p-isomer is the major product.

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Similar questions

Assertion (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

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Reason:

CaO

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Assertion :Phenol forms 2,4,6-tribromophenol on treatment with Br2 water at 273 K. Reason: Phenol is o,p-directing group.

Assertion :Phenol forms 2,4,6-tribromophenol on treatment with $B r_{2}$ water at 273 K. Reason: Phenol is o,p-directing group.