NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323356
A compound ' X ' when treated with phthalic anhydride in presence of concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) yields ' Y '. ' Y ' is used as an acid/base indicator. ' X ' and 'Y' respectively are :
1 carbolic acid, phenolphthalein
2 toluidine, phenolphthalein.
3 anisole, methyl orange
4 salicylaldehyde, phenolphthalein
Explanation:
Carbolic acid (commonly known as phenol) reacts with phthalic anhydride in the presence of conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to form phenolphthalein. Phenolphthalein is an acid/base indicator. Thus, X is carbolic acid and Y is phenolphthalein.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323357
The following reaction is known as
1 Wurtz reaction
2 Kolbe reaction
3 Riemer-Tiemann reaction
4 Schotten-Baumann reaction
Explanation:
Benzoylation of phenol is known as Schotten Baumann reaction.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323358
Assertion : Treatment of phenol with nitrous acid yields p-benzoquinone monoxime. Reason : p-Nitrosophenol and p-benzoquinone monoxime are tautomers.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
When phenol, reacts with nitrous acid \(\left(\mathrm{HNO}_{2}\right)\), the hydroxyl group (-OH) on phenol is replaced by a nitroso group (-NO) to form p-nitrosophenol. p-nitrosophenol can exist in two tautomeric forms. In one form, it has a nitroso group (-NO) attached to the benzene ring, and in the other form, it becomes p-benzoquinone monoxime by the migration of a hydrogen atom and rearrangement of electrons within the molecule. So the option (2) is correct.
323356
A compound ' X ' when treated with phthalic anhydride in presence of concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) yields ' Y '. ' Y ' is used as an acid/base indicator. ' X ' and 'Y' respectively are :
1 carbolic acid, phenolphthalein
2 toluidine, phenolphthalein.
3 anisole, methyl orange
4 salicylaldehyde, phenolphthalein
Explanation:
Carbolic acid (commonly known as phenol) reacts with phthalic anhydride in the presence of conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to form phenolphthalein. Phenolphthalein is an acid/base indicator. Thus, X is carbolic acid and Y is phenolphthalein.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323357
The following reaction is known as
1 Wurtz reaction
2 Kolbe reaction
3 Riemer-Tiemann reaction
4 Schotten-Baumann reaction
Explanation:
Benzoylation of phenol is known as Schotten Baumann reaction.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323358
Assertion : Treatment of phenol with nitrous acid yields p-benzoquinone monoxime. Reason : p-Nitrosophenol and p-benzoquinone monoxime are tautomers.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
When phenol, reacts with nitrous acid \(\left(\mathrm{HNO}_{2}\right)\), the hydroxyl group (-OH) on phenol is replaced by a nitroso group (-NO) to form p-nitrosophenol. p-nitrosophenol can exist in two tautomeric forms. In one form, it has a nitroso group (-NO) attached to the benzene ring, and in the other form, it becomes p-benzoquinone monoxime by the migration of a hydrogen atom and rearrangement of electrons within the molecule. So the option (2) is correct.
323356
A compound ' X ' when treated with phthalic anhydride in presence of concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) yields ' Y '. ' Y ' is used as an acid/base indicator. ' X ' and 'Y' respectively are :
1 carbolic acid, phenolphthalein
2 toluidine, phenolphthalein.
3 anisole, methyl orange
4 salicylaldehyde, phenolphthalein
Explanation:
Carbolic acid (commonly known as phenol) reacts with phthalic anhydride in the presence of conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to form phenolphthalein. Phenolphthalein is an acid/base indicator. Thus, X is carbolic acid and Y is phenolphthalein.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323357
The following reaction is known as
1 Wurtz reaction
2 Kolbe reaction
3 Riemer-Tiemann reaction
4 Schotten-Baumann reaction
Explanation:
Benzoylation of phenol is known as Schotten Baumann reaction.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323358
Assertion : Treatment of phenol with nitrous acid yields p-benzoquinone monoxime. Reason : p-Nitrosophenol and p-benzoquinone monoxime are tautomers.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
When phenol, reacts with nitrous acid \(\left(\mathrm{HNO}_{2}\right)\), the hydroxyl group (-OH) on phenol is replaced by a nitroso group (-NO) to form p-nitrosophenol. p-nitrosophenol can exist in two tautomeric forms. In one form, it has a nitroso group (-NO) attached to the benzene ring, and in the other form, it becomes p-benzoquinone monoxime by the migration of a hydrogen atom and rearrangement of electrons within the molecule. So the option (2) is correct.
323356
A compound ' X ' when treated with phthalic anhydride in presence of concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) yields ' Y '. ' Y ' is used as an acid/base indicator. ' X ' and 'Y' respectively are :
1 carbolic acid, phenolphthalein
2 toluidine, phenolphthalein.
3 anisole, methyl orange
4 salicylaldehyde, phenolphthalein
Explanation:
Carbolic acid (commonly known as phenol) reacts with phthalic anhydride in the presence of conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to form phenolphthalein. Phenolphthalein is an acid/base indicator. Thus, X is carbolic acid and Y is phenolphthalein.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323357
The following reaction is known as
1 Wurtz reaction
2 Kolbe reaction
3 Riemer-Tiemann reaction
4 Schotten-Baumann reaction
Explanation:
Benzoylation of phenol is known as Schotten Baumann reaction.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323358
Assertion : Treatment of phenol with nitrous acid yields p-benzoquinone monoxime. Reason : p-Nitrosophenol and p-benzoquinone monoxime are tautomers.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
When phenol, reacts with nitrous acid \(\left(\mathrm{HNO}_{2}\right)\), the hydroxyl group (-OH) on phenol is replaced by a nitroso group (-NO) to form p-nitrosophenol. p-nitrosophenol can exist in two tautomeric forms. In one form, it has a nitroso group (-NO) attached to the benzene ring, and in the other form, it becomes p-benzoquinone monoxime by the migration of a hydrogen atom and rearrangement of electrons within the molecule. So the option (2) is correct.
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