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Q. No.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 |
51%
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Subtopic: Alcohols: Preparation & Properties | Mechanism of Dehydration, Methanol & Ethanol |
65%
Level 2: 60%+
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Subtopic: Alcohols: Preparation & Properties |
64%
Level 2: 60%+
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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: | Lucas reagent, a mixture of concentrated HCl and anhydrous ZnCl₂, is used to distinguish primary, secondary, and tertiary alcohols based on their reactivity. |
| 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 are correct |
| 3. | Both I and II are incorrect |
| 4. | I is correct, but II is incorrect |
Subtopic: Alcohols: Preparation & Properties |
82%
Level 1: 80%+
NEET - 2022
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The IUPAC name of the product that formed in the following chemical reaction is:
\(\text{Acetone}\xrightarrow[\bf\text{(ii) H}_2\text{O, H}^+]{\bf\text{(i) C}_2\text H_5\text{MgBr, dry Ether}}\text{Product } \)
| 1. | Pentan-3-ol | 2. | 2-Methyl butan-2-ol |
| 3. | 2-Methyl propan-2-ol | 4. | Pentan-2-ol |
Subtopic: Alcohols: Preparation & Properties |
75%
Level 2: 60%+
NEET - 2021
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A reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:
| 1. | sec-Butyl alcohol | 2. | tert-Butyl alcohol |
| 3. | iso-Butyl alcohol | 4. | iso-Propyl alcohol |
Subtopic: Alcohols: Preparation & Properties |
73%
Level 2: 60%+
NEET - 2020
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Links
Mark the reaction among the following that does not give benzoic acid as the major product:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Alcohols: Preparation & Properties |
79%
Level 2: 60%+
NEET - 2019
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Compound A, is found to react with NaOI (produced by reacting Y with NaOH) and yield a yellow precipitate with a characteristic smell. A and Y are respectively?
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Alcohols: Preparation & Properties |
65%
Level 2: 60%+
NEET - 2018
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Subtopic: Mechanism of Dehydration, Methanol & Ethanol |
53%
Level 3: 35%-60%
NEET - 2023
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Match the reagents (List-I) with the products (List-II) obtained from phenol:
| List-I | List-II | ||
| (A) | (i) NaOH (ii) CO2 (iii) H+ |
(I) | Benzoquinone |
| (B) | (i) Aqueous NaOH + CHCl3 (ii) H+ |
(II) | Benzene |
| (C) | Zn dust, \(\Delta\) | (III) | Salicylaldehyde |
| (D) | Na2Cr2O7, H2SO4 | (IV) | Salicylic acid |
| (A) | (B) | (C) | (D) | |
| 1. | (III) | (IV) | (I) | (II) |
| 2. | (II) | (I) | (IV) | (III) |
| 3. | (IV) | (III) | (II) | (I) |
| 4. | (IV) | (II) | (I) | (III) |
Subtopic: Phenols: Preparation & Properties |
90%
Level 1: 80%+
NEET - 2022
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