Q. No.Compound P (C8H8O) gives a red orange precipitate with 2,4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, P gives an aromatic product Q that produces effervescence on treating with aq. NaHCO3; Compounds P and Q, respectively, are :
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Aldehydes & Ketones: Preparation & Properties | Carboxylic Acids: Preparation & Properties |
60%
Level 2: 60%+
NEET - 2026
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Consider the following reaction, and choose the correct option.
| 1. | Compound P is obtained by the hydrogenation of benzoyl chloride with Pd on \(BaSO_4\). |
| 2. | On treating compound P with saturated \(NaHCO_3\) solution, brisk effervescence is observed. |
| 3. | Compound P can be prepared by treating benzene with anhydrous \(AlCl_3\) and \(CH_3COC1\). |
| 4. | On treatment with bromine water, compound P gives a white precipitate. |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
57%
Level 3: 35%-60%
NEET - 2026
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The compound that CANNOT be obtained from the aldol condensation reaction shown below, is:
1. |
 |
2. |  |
| 3. |  |
4. |
 |
Subtopic: Aldehydes & Ketones: Preparation & Properties | Name Reaction |
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Level 2: 60%+
NEET - 2026
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For the following reaction sequence, choose the correct option
| 1. | Both P and Q are carbonyl compounds. |
| 2. | If P is the sodium salt of a carboxylic acid, Q is a primary alcohol. |
| 3. | P and Q are aromatic compounds. |
| 4. | If P gives a carboxylic acid on acidification, Q gives a poisonous gas on exposure to air and light. |
Subtopic: Aldehydes & Ketones: Preparation & Properties | Carboxylic Acids: Preparation & Properties | Name Reaction |
53%
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NEET - 2026
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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) \(H_2O\) |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
NEET - 2025
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Subtopic: Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
NEET - 2025
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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 |
74%
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 |
59%
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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 | \(\mathrm{{(i) \; {CrO}_2 {Cl}_2, {CS}_2\\ (ii) ~{H}_2 {O}/H^+}}\) | II | Reimer-Tiemann reaction |
| C | \(\mathrm{{CO, HCl, Anhyd.~\\ {AlCl}_3 / {CuCl}}}\) | III | Etard reaction |
| D | \(\mathrm{{CHCl}_3, {NaOH}}\) | IV | Rosenmund reduction |
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
Subtopic: Aldehydes & Ketones: Preparation & Properties |
92%
Level 1: 80%+
NEET - 2024
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Subtopic: Aldehydes & Ketones: Preparation & Properties |
73%
Level 2: 60%+
NEET - 2024
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