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Q. No.Identify the correct reagents that would bring about the following transformation.
1. \(\text { (i) } \mathrm{BH}_3\)
\((ii) \mathrm{H}_2 \mathrm{O}_2 / \stackrel{\ominus}{\mathrm{OH}}\)
\(\text { (iii) } \mathrm{P C C}\)
2. \(\text { (i) } \mathrm{BH}_3\)
\((ii) \mathrm{H}_2 \mathrm{O}_2 / \stackrel{\ominus}{\mathrm{OH}}\)
\(\text { (iii) alk. } \mathrm{KMnO}_4\)
\(\text { (iv) } \mathrm{H}_3 \mathrm{O}^{+}\)
3. \(\text { (i) } \mathrm{H}_2 \mathrm{O} / \mathrm{H}^{+}\)
\(\text { (ii) } \mathrm{P C C}\)
4. \(\text { (i) } \mathrm{H}_2 \mathrm{O} / \mathrm{H}^{+}\)
\(\text { (ii) } \mathrm{CrO}_3\)
1. \(\text { (i) } \mathrm{BH}_3\)
\((ii) \mathrm{H}_2 \mathrm{O}_2 / \stackrel{\ominus}{\mathrm{OH}}\)
\(\text { (iii) } \mathrm{P C C}\)
2. \(\text { (i) } \mathrm{BH}_3\)
\((ii) \mathrm{H}_2 \mathrm{O}_2 / \stackrel{\ominus}{\mathrm{OH}}\)
\(\text { (iii) alk. } \mathrm{KMnO}_4\)
\(\text { (iv) } \mathrm{H}_3 \mathrm{O}^{+}\)
3. \(\text { (i) } \mathrm{H}_2 \mathrm{O} / \mathrm{H}^{+}\)
\(\text { (ii) } \mathrm{P C C}\)
4. \(\text { (i) } \mathrm{H}_2 \mathrm{O} / \mathrm{H}^{+}\)
\(\text { (ii) } \mathrm{CrO}_3\)
Subtopic: Â Alcohols: Preparation & Properties |
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Which one of the following alcohols reacts instantaneously with Lucas reagent?
| 1. |  |
| 2. |  |
| 3. |  |
| 4. | \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2 \mathrm{OH}\) |
Subtopic: Â Alcohols: Preparation & Properties |
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Subtopic: Â Alcohols: Preparation & Properties |
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NEET - 2023
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Subtopic: Â Mechanism of Dehydration, Methanol & Ethanol |
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Subtopic: Â Ethers: Preparation & Properties, Uses |
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Reagents that can be used to convert alcohols to carboxylic acids are:
(A) CrO3 - H2SO4
(B) K2Cr2O7 + H2SO4
(C) KMnO4 + KOH/H3O+
(D) Cu, 573 K
(E) CrO3+ (CH3CO)2O
Choose the most appropriate answer from the options given below:
(A) CrO3 - H2SO4
(B) K2Cr2O7 + H2SO4
(C) KMnO4 + KOH/H3O+
(D) Cu, 573 K
(E) CrO3+ (CH3CO)2O
Choose the most appropriate answer from the options given below:
| 1. | (B), (C) and (D) only | 2. | (B), (D) and (E) only |
| 3. | (A), (B) and (C) only | 4. | (A), (B) and (E) only |
Subtopic: Â Alcohols: Preparation & Properties |
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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: Â Alcohols: Preparation & Properties |
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Subtopic: Â Alcohols: Preparation & Properties |Â Mechanism of Dehydration, Methanol & Ethanol |
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| I: | The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group. |
| II: | o-nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring. |
| 1. | I is incorrect but II is correct. |
| 2. | Both I and II are correct. |
| 3. | Both I and II are incorrect. |
| 4. | I is correct but II is incorrect. |
Subtopic: Â Phenols: Preparation & Properties |
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NEET 2025 - Target Batch
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Given below are two statements:
In light of the above statements, choose the most appropriate answer from the options given below:
| Statement I. | In Lucas test, primary, secondary, and tertiary alcohols are distinguished on the basis of their reactivity with conc. \(HCl + ZnCl_2\), known as Lucas Reagent. |
| Statement II. | Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent. |
| 1. | I is incorrect but II is correct |
| 2. | Both I and II correct |
| 3. | Both I and II are incorrect |
| 4. | I is correct but II is incorrect |
Subtopic: Â Alcohols: Preparation & Properties |
 77%
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NEET - 2022
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