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Assertion (A) Phenol forms 2, 4, 6-tribr...

Assertion (A) Phenol forms 2, 4, 6-tribromophenol o treatment with `Br_(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.

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.

Text Solution

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The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Analyze the Assertion The assertion states that phenol forms 2,4,6-tribromophenol when treated with bromine in carbon disulfide at 273 K. - When phenol reacts with bromine, it can undergo electrophilic substitution. - The positions where bromine can be substituted are ortho (2-position), meta (4-position), and para (6-position). - However, the reaction typically leads to the formation of ortho and para products primarily, not directly to 2,4,6-tribromophenol unless excess bromine is used. - Therefore, the assertion is **incorrect** because it implies that phenol directly forms 2,4,6-tribromophenol without specifying the need for excess bromine. ### Step 2: Analyze the Reason The reason states that bromine polarizes in carbon disulfide. - In carbon disulfide, bromine does not polarize significantly. - Polarization refers to the ability of a molecule to develop a dipole moment in response to an electric field. Bromine in carbon disulfide does not exhibit this behavior effectively. - Thus, the reason is also **incorrect**. ### Conclusion Since both the assertion and the reason are incorrect, the correct answer is: **(b) Assertion and reason both are wrong statements.** ---

To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Analyze the Assertion The assertion states that phenol forms 2,4,6-tribromophenol when treated with bromine in carbon disulfide at 273 K. - When phenol reacts with bromine, it can undergo electrophilic substitution. - The positions where bromine can be substituted are ortho (2-position), meta (4-position), and para (6-position). - However, the reaction typically leads to the formation of ortho and para products primarily, not directly to 2,4,6-tribromophenol unless excess bromine is used. ...
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NCERT EXEMPLAR ENGLISH-ALCOHOLS, PHENOLS AND ETHERS-All Questions
  1. The carbon-oxygen bond in phenol is slightly stronger than that in met...

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  2. Arrange water, ethanol and phenol in increasing order of acidity and g...

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  3. Match the structures of the compounds given in Column I with the name ...

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  4. Match the starting material given in Column I with the products formed...

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  5. Match the items of Column I with items of Column II.

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  6. Match the items of Column I with items of Column II.

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  7. Assertion (A) Addition reaction of water to but-1-ene in acidic medium...

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  8. Assertion (A) p-nitrophenol is more acidic than phenol. Reason (R) N...

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  9. Assertion (A) IUPAC name of the compound CH(3)-underset(CH(3))unders...

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  10. Assertion (A) Bond angle is ethers is slightly less than tetrahedral a...

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  11. Assertion (A) Boiling points of alcohols and ethers are high. Reason...

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  12. Assertion (A) Like bromination of benzene, bromination of phenol is al...

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  13. Assertion (A) o-nitrophenol is less soluble in water than the m and p-...

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  14. Assertion (A) Ethanol is a weaker acid than phenol. Reason (R) Sodiu...

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  15. Assertion (A) Phenol forms 2, 4, 6-tribromophenol o treatment with Br(...

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  16. Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc....

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  17. Write the mechanism of the reaction of HI with methoxybenzene.

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  18. (a) Name the starting material used in the industrial preparation of p...

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  19. How can phenol be converted to aspirin ?

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  20. Explain a process in which a biocatalyst is used industrial preparatio...

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