Q. No.Identify the suitable reagent for the following conversion
1. (i) \(NaBH_4\), (ii) \(H^+/H_2O\)
2. \(H_2/ Pd-BaSO_4\)
3. (i) \(LiAlH_4\), (ii) \(H^+/H_2O\)
4. (i)\(AlH(iBu)_2\)(ii) \(H_2O\)
1. (i) \(NaBH_4\), (ii) \(H^+/H_2O\)
2. \(H_2/ Pd-BaSO_4\)
3. (i) \(LiAlH_4\), (ii) \(H^+/H_2O\)
4. (i)\(AlH(iBu)_2\)(ii) \(H_2O\)
Subtopic: Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
NEET - 2025
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Please attempt this question first.
Subtopic: Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
NEET - 2025
Please attempt this question first.
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Match the reactions listed in List-I with the appropriate reagents or conditions listed in List-II:
Choose the correct answer from the options given below:
| List-I (Reaction) |
List-II (Reagents/ Condition) |
||
| A. |  |
I. |  |
| B. |  |
II. | \(\mathrm{CrO}_3\) |
| C. |  |
III. | \(\begin{aligned} & \mathrm{KMnO}_4 \\ & \mathrm{KOH}, \Delta \end{aligned}\) |
| D. |  |
IV. | \(\mathrm{(i) \mathrm{O}_3\\ (ii) \mathrm{Zn}-\mathrm{H}_2 \mathrm{O}}\) |
| 1. | \(\text { A-III, B-I, C-II, D-IV }\) |
| 2. | \(\text { A-IV, B-I, C-II, D-III }\) |
| 3. | \(\text { A-I, B-IV, C-II, D-III }\) |
| 4. | \(\text { A-IV,B-I, C-III, D-II }\) |
Subtopic: Aldehydes & Ketones: Preparation & Properties | Carboxylic Acids: Preparation & Properties |
75%
Level 2: 60%+
NEET - 2024
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Which solution is part of Fehling solution 'A' (used in tests for reducing sugars and aldehydes)?
| 1. | Alkaline copper sulphate |
| 2. | Alkaline solution of sodium potassium tartrate (Rochelle's salt) |
| 3. | Aqueous sodium citrate |
| 4. | Aqueous copper sulphate |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
61%
Level 2: 60%+
NEET - 2024
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Match the reagents in List-I with the corresponding reactions in List-II:
Choose the correct answer from the options given below:
1. A-II, B-III, C-I, D-IV
2. A-IV, B-III, C-I, D-II
3. A-I, B-III, C-IV, D-II
4. A-II, B-I, C-III, D-IV
| List-I (Reagent) |
List-II (Name of the reaction) |
||
| A. | \(\mathrm{{H}_2, {Pd}-{Ba}S {O}_4}\) | I. | Gattermann-Koch reaction |
| B. | \(\mathrm{{(i) \; {CrO}_2 {Cl}_2, {CS}_2\\ (ii) {H}_2 {C}}}\) | II. | Reimer-Tiemann reaction |
| C. | \(\mathrm{{CO, HCl, Anhyd.~\\ {AlCl}_3 / {CuCl}}}\) | III. | Etard reaction |
| D. | \(\mathrm{{CHCl}_3, {NaOH}}\) | IV. | Rosenmund reduction |
1. A-II, B-III, C-I, D-IV
2. A-IV, B-III, C-I, D-II
3. A-I, B-III, C-IV, D-II
4. A-II, B-I, C-III, D-IV
Subtopic: Aldehydes & Ketones: Preparation & Properties |
92%
Level 1: 80%+
NEET - 2024
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Subtopic: Aldehydes & Ketones: Preparation & Properties |
74%
Level 2: 60%+
NEET - 2024
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Subtopic: Aldehydes & Ketones: Preparation & Properties | Carboxylic Acids: Preparation & Properties |
64%
Level 2: 60%+
NEET - 2023
Hints
Identify the final product [D] obtained in the following sequence of reactions:
| 1. | \(\mathrm{HC\equiv C^-~Na^+}\) | 2. |  |
| 3. |  |
4. | \(\mathrm{C_4H_{10}}\) |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
76%
Level 2: 60%+
NEET - 2023
Hints
Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I | The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions. |
| Statement II | The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding. |
| 1. | Statement I is incorrect but Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct but Statement II is incorrect. |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
65%
Level 2: 60%+
NEET - 2022
Hints
The correct IUPAC name of the following compound is:
| 1. | 2-Ethylhex-3-en-4-one | 2. | 4-Methylhex-3-en-2-one |
| 3. | 4-Ethylpent-3-en-2-one | 4. | 3-Methylhex -3-en-4-one |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
87%
Level 1: 80%+
NEET - 2022
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