323308
At low temperature, phenol reacts with \(\mathrm{Br}_{2}\) in \(\mathrm{CS}_{2}\) to form
1 m-bromophenol
2 o-and p-bromophenol
3 p-bromophenol
4 2, 4, 6-tribromophenol
Explanation:
In the presence of non-polar solvent \(\left(\mathrm{CS}_{2}\right)\), the ionisation of phenol is suppressed. The ring is slightly activated and hence monosubstitution occurs.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323309
Name of compound 'B' is
1 Oil of wintergreen
2 Aspirin
3 Salol
4 Phenol
Explanation:
Oil of winter green
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323310
Assertion : Phenols cannot be converted into esters by direct reaction with carboxylic acids. Reason : Electron withdrawing groups increase the acidity of phenols.
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:
Phenols, being less nucleophilic than alcohols, do not directly react with carboxylic acids to form esters, requiring alternative methods for esterification. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323311
Identify the product \((\mathrm{X})\) formed in the following reaction. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \stackrel{\mathrm{H}+}{\rightleftharpoons} \mathrm{X}\)
Phenol reacts with carboxylic acid to form ester. \({{\text{C}}_6}{{\text{H}}_5}{\text{OH}} + {\text{C}}{{\text{H}}_3}{\text{COOH}}\mathop \rightleftharpoons \limits^{{\text{H}} + } \) \({{\text{C}}_6}{{\text{H}}_5}{\text{O}} - {\text{CO}} - {\text{C}}{{\text{H}}_3} + {{\text{H}}_2}{\text{O}}\)
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323312
Statement A : Reimer-Tiemann reaction of phenol with \(\mathrm{CCl}_{4}\) in \(\mathrm{NaOH}\) at \(340 \mathrm{~K}\) gives salicyclic acid as the major product. Statement B : Nucleophilic attack of phenolate ion through the para-carbon atom.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both statements are incorrect.
Explanation:
Nucleophilic attak of phenolate ion through the ortho-carbon atom occurs on \(\mathrm{CCl}_{4}\) (a neutral electrophile) to form an intermediate which on hydrolysis gives salicylic acid (ArSE reaction).
323308
At low temperature, phenol reacts with \(\mathrm{Br}_{2}\) in \(\mathrm{CS}_{2}\) to form
1 m-bromophenol
2 o-and p-bromophenol
3 p-bromophenol
4 2, 4, 6-tribromophenol
Explanation:
In the presence of non-polar solvent \(\left(\mathrm{CS}_{2}\right)\), the ionisation of phenol is suppressed. The ring is slightly activated and hence monosubstitution occurs.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323309
Name of compound 'B' is
1 Oil of wintergreen
2 Aspirin
3 Salol
4 Phenol
Explanation:
Oil of winter green
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323310
Assertion : Phenols cannot be converted into esters by direct reaction with carboxylic acids. Reason : Electron withdrawing groups increase the acidity of phenols.
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:
Phenols, being less nucleophilic than alcohols, do not directly react with carboxylic acids to form esters, requiring alternative methods for esterification. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323311
Identify the product \((\mathrm{X})\) formed in the following reaction. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \stackrel{\mathrm{H}+}{\rightleftharpoons} \mathrm{X}\)
Phenol reacts with carboxylic acid to form ester. \({{\text{C}}_6}{{\text{H}}_5}{\text{OH}} + {\text{C}}{{\text{H}}_3}{\text{COOH}}\mathop \rightleftharpoons \limits^{{\text{H}} + } \) \({{\text{C}}_6}{{\text{H}}_5}{\text{O}} - {\text{CO}} - {\text{C}}{{\text{H}}_3} + {{\text{H}}_2}{\text{O}}\)
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323312
Statement A : Reimer-Tiemann reaction of phenol with \(\mathrm{CCl}_{4}\) in \(\mathrm{NaOH}\) at \(340 \mathrm{~K}\) gives salicyclic acid as the major product. Statement B : Nucleophilic attack of phenolate ion through the para-carbon atom.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both statements are incorrect.
Explanation:
Nucleophilic attak of phenolate ion through the ortho-carbon atom occurs on \(\mathrm{CCl}_{4}\) (a neutral electrophile) to form an intermediate which on hydrolysis gives salicylic acid (ArSE reaction).
323308
At low temperature, phenol reacts with \(\mathrm{Br}_{2}\) in \(\mathrm{CS}_{2}\) to form
1 m-bromophenol
2 o-and p-bromophenol
3 p-bromophenol
4 2, 4, 6-tribromophenol
Explanation:
In the presence of non-polar solvent \(\left(\mathrm{CS}_{2}\right)\), the ionisation of phenol is suppressed. The ring is slightly activated and hence monosubstitution occurs.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323309
Name of compound 'B' is
1 Oil of wintergreen
2 Aspirin
3 Salol
4 Phenol
Explanation:
Oil of winter green
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323310
Assertion : Phenols cannot be converted into esters by direct reaction with carboxylic acids. Reason : Electron withdrawing groups increase the acidity of phenols.
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:
Phenols, being less nucleophilic than alcohols, do not directly react with carboxylic acids to form esters, requiring alternative methods for esterification. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323311
Identify the product \((\mathrm{X})\) formed in the following reaction. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \stackrel{\mathrm{H}+}{\rightleftharpoons} \mathrm{X}\)
Phenol reacts with carboxylic acid to form ester. \({{\text{C}}_6}{{\text{H}}_5}{\text{OH}} + {\text{C}}{{\text{H}}_3}{\text{COOH}}\mathop \rightleftharpoons \limits^{{\text{H}} + } \) \({{\text{C}}_6}{{\text{H}}_5}{\text{O}} - {\text{CO}} - {\text{C}}{{\text{H}}_3} + {{\text{H}}_2}{\text{O}}\)
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323312
Statement A : Reimer-Tiemann reaction of phenol with \(\mathrm{CCl}_{4}\) in \(\mathrm{NaOH}\) at \(340 \mathrm{~K}\) gives salicyclic acid as the major product. Statement B : Nucleophilic attack of phenolate ion through the para-carbon atom.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both statements are incorrect.
Explanation:
Nucleophilic attak of phenolate ion through the ortho-carbon atom occurs on \(\mathrm{CCl}_{4}\) (a neutral electrophile) to form an intermediate which on hydrolysis gives salicylic acid (ArSE reaction).
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CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323308
At low temperature, phenol reacts with \(\mathrm{Br}_{2}\) in \(\mathrm{CS}_{2}\) to form
1 m-bromophenol
2 o-and p-bromophenol
3 p-bromophenol
4 2, 4, 6-tribromophenol
Explanation:
In the presence of non-polar solvent \(\left(\mathrm{CS}_{2}\right)\), the ionisation of phenol is suppressed. The ring is slightly activated and hence monosubstitution occurs.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323309
Name of compound 'B' is
1 Oil of wintergreen
2 Aspirin
3 Salol
4 Phenol
Explanation:
Oil of winter green
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323310
Assertion : Phenols cannot be converted into esters by direct reaction with carboxylic acids. Reason : Electron withdrawing groups increase the acidity of phenols.
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:
Phenols, being less nucleophilic than alcohols, do not directly react with carboxylic acids to form esters, requiring alternative methods for esterification. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323311
Identify the product \((\mathrm{X})\) formed in the following reaction. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \stackrel{\mathrm{H}+}{\rightleftharpoons} \mathrm{X}\)
Phenol reacts with carboxylic acid to form ester. \({{\text{C}}_6}{{\text{H}}_5}{\text{OH}} + {\text{C}}{{\text{H}}_3}{\text{COOH}}\mathop \rightleftharpoons \limits^{{\text{H}} + } \) \({{\text{C}}_6}{{\text{H}}_5}{\text{O}} - {\text{CO}} - {\text{C}}{{\text{H}}_3} + {{\text{H}}_2}{\text{O}}\)
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323312
Statement A : Reimer-Tiemann reaction of phenol with \(\mathrm{CCl}_{4}\) in \(\mathrm{NaOH}\) at \(340 \mathrm{~K}\) gives salicyclic acid as the major product. Statement B : Nucleophilic attack of phenolate ion through the para-carbon atom.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both statements are incorrect.
Explanation:
Nucleophilic attak of phenolate ion through the ortho-carbon atom occurs on \(\mathrm{CCl}_{4}\) (a neutral electrophile) to form an intermediate which on hydrolysis gives salicylic acid (ArSE reaction).
323308
At low temperature, phenol reacts with \(\mathrm{Br}_{2}\) in \(\mathrm{CS}_{2}\) to form
1 m-bromophenol
2 o-and p-bromophenol
3 p-bromophenol
4 2, 4, 6-tribromophenol
Explanation:
In the presence of non-polar solvent \(\left(\mathrm{CS}_{2}\right)\), the ionisation of phenol is suppressed. The ring is slightly activated and hence monosubstitution occurs.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323309
Name of compound 'B' is
1 Oil of wintergreen
2 Aspirin
3 Salol
4 Phenol
Explanation:
Oil of winter green
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323310
Assertion : Phenols cannot be converted into esters by direct reaction with carboxylic acids. Reason : Electron withdrawing groups increase the acidity of phenols.
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:
Phenols, being less nucleophilic than alcohols, do not directly react with carboxylic acids to form esters, requiring alternative methods for esterification. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323311
Identify the product \((\mathrm{X})\) formed in the following reaction. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \stackrel{\mathrm{H}+}{\rightleftharpoons} \mathrm{X}\)
Phenol reacts with carboxylic acid to form ester. \({{\text{C}}_6}{{\text{H}}_5}{\text{OH}} + {\text{C}}{{\text{H}}_3}{\text{COOH}}\mathop \rightleftharpoons \limits^{{\text{H}} + } \) \({{\text{C}}_6}{{\text{H}}_5}{\text{O}} - {\text{CO}} - {\text{C}}{{\text{H}}_3} + {{\text{H}}_2}{\text{O}}\)
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323312
Statement A : Reimer-Tiemann reaction of phenol with \(\mathrm{CCl}_{4}\) in \(\mathrm{NaOH}\) at \(340 \mathrm{~K}\) gives salicyclic acid as the major product. Statement B : Nucleophilic attack of phenolate ion through the para-carbon atom.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both statements are incorrect.
Explanation:
Nucleophilic attak of phenolate ion through the ortho-carbon atom occurs on \(\mathrm{CCl}_{4}\) (a neutral electrophile) to form an intermediate which on hydrolysis gives salicylic acid (ArSE reaction).
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