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Q. No.Select the correct option based on statements below:
Assertion (A):
Boiling points of alcohols and ethers are high.
Reason (R):
They can form intermolecular hydrogen bonding.
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: Alcohols: Preparation & Properties |
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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 |
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Select the correct option based on statements below:
| Assertion (A): | o-Nitrophenol is less soluble in water than the m and p-isomers. |
| Reason (R): | m and p-Nitrophenols exist as associated molecules. |
| 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: Phenols: Preparation & Properties |
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Select the correct option based on statements below:
| Assertion (A): | Ethanol is a weaker acid than phenol. |
| Reason (R): | Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH. |
| 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: Phenols: Preparation & Properties |
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Select the correct option based on statements 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 |
71%
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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 |
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Subtopic: Alcohols: Preparation & Properties |
52%
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The number of monohydric phenols that can have the molecular formula, \(\mathrm{C}_7 \mathrm{H}_8 \mathrm{O}\) are:
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
Subtopic: Alcohols: Preparation & Properties |
58%
From NCERT
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Phenol is more acidic than ethanol due to:
1. Resonance
2. Phenoxide ions
3. Less -I effect
4. More ability to gain a proton
Subtopic: Phenols: Preparation & Properties |
59%
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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 |
77%
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