- 1(current)
Q. No.The group that activates the benzene ring towards electrophilic substitution reaction is:
| 1. | OH | 2. | NO2 |
| 3. | CN | 4. | COOH |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
78%
From NCERT
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Select the correct option based on statements below:
| Assertion (A): | -OH, -OCH3 groups are o, p-directing. |
| Reason (R): | Ring is activated by the resonance effect of -OH, -OCH3 groups. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
77%
From NCERT
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An appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene is/are :
| 1. |  |
| 2. |  |
| 3. | \(\mathrm{CH_3-CH_2-CH_2-O-CH_3+HBr}\) |
| 4. | \(\mathrm{(CH_3)_3C-OC_2H_5+HI}\) |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
79%
From NCERT
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Select the correct option based on the statements given below:
| Assertion (A): | Phenol forms 2,4,6-tribromophenol on treatment with Br2 in carbon disulphide at 273K. |
| Reason (R): | Bromine polarises in carbon disulphide. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
72%
From NCERT
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The alkoxy group in aryl alkyl ethers activates the benzene ring towards:
1. Nucleophilic addition reaction
2. Electrophilic addition reaction
3. Nucleophilic substitution reaction
4. Electrophilic substitution reaction
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
62%
From NCERT
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Select the correct option based on statements below:
| Assertion (A): | Like the bromination of benzene, bromination of phenol is carried out in the presence of Lewis acid. |
| Reason (R): | Lewis acid polarizes the bromine molecule. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
From NCERT
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Select the correct option based on the statements below:
| Assertion (A): | Phenols give o-and p-nitrophenol on nitration with conc. HNO3 and H2SO4 mixture. |
| Reason (R): | —OH group in phenol is o-, p-directing. |
| 1. | Both (A) and (R) are True, and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
From NCERT
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- 1(current)
Q. No.
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