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Q. No.Consider the following structures:
I
II
III
IV
The resonating structures of phenol among the given structures above are:
1. II and III only
2. I, II and III only
3. I, II and IV only
4. II and IV only
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
73%
Level 2: 60%+
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Subtopic: Ethers: Preparation & Properties, Uses |
91%
Level 1: 80%+
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The number of isomeric alcohols (excluding stereoisomers) of molecular formula C6H14O which give a positive iodoform test are:
1. Three
2. Four
3. Five
4. Two
1. Three
2. Four
3. Five
4. Two
Subtopic: Alcohols: Preparation & Properties |
Level 3: 35%-60%
NEET - 2013
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Subtopic: Alcohols: Preparation & Properties |
65%
Level 2: 60%+
NEET - 2022
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| I: | The product of the reaction of phenol with bromine depends on the nature of the solvent. |
| II: | The reaction of phenol with bromine in CHCl3 gives a monosubstituted bromo derivative whereas the reaction of phenol with bromine water yields a trisubstituted bromo derivative of phenol. |
In light of the above statements, choose the most appropriate answer from the options given below:
| 1. | I is correct and II is incorrect |
| 2. | I is incorrect and II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Electrophilic Substitution Reactions, Uses of Phenols |
85%
Level 1: 80%+
NEET - 2022
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Subtopic: Alcohols: Preparation & Properties |
72%
Level 2: 60%+
NEET - 2023
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Consider the following reactions:
\({R-COOH\xrightarrow[(ii)~H_2O/HCl]{(i)~X}R-CH_2OH }\)
\(\small{R-CH=CH_2\xrightarrow[(ii)~H_2O/ NaOH/ H_2O_2]{(i)~X}R-CH_2-CH_2-OH}\)
Identify 'X' in above reactions:
\({R-COOH\xrightarrow[(ii)~H_2O/HCl]{(i)~X}R-CH_2OH }\)
\(\small{R-CH=CH_2\xrightarrow[(ii)~H_2O/ NaOH/ H_2O_2]{(i)~X}R-CH_2-CH_2-OH}\)
Identify 'X' in above reactions:
| 1. | \(B_2H_6 \) | 2. | \(LiAlH_4 \) |
| 3. | \(NaBH_4 \) | 4. | \(H_2/Pd \) |
Subtopic: Alcohols: Preparation & Properties |
50%
Level 3: 35%-60%
NEET - 2023
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Subtopic: Alcohols: Preparation & Properties | Mechanism of Dehydration, Methanol & Ethanol |
65%
Level 2: 60%+
NEET - 2023
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Subtopic: Ethers: Preparation & Properties, Uses |
83%
Level 1: 80%+
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Phenol reacts with chloroform in the presence of sodium hydroxide to form salicylaldehyde.
This reaction is known as:
1. Kolbe's reaction
2. Reimer-Tiemann reaction
3. Stephan reaction
4. Etard reaction
This reaction is known as:
1. Kolbe's reaction
2. Reimer-Tiemann reaction
3. Stephan reaction
4. Etard reaction
Subtopic: Mechanism of Dehydration, Methanol & Ethanol |
89%
Level 1: 80%+
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