NEET Exam > NEET Notes > Chemistry Class 12 > Mnemonics: Aldehydes, Ketones and Carboxylic Acids
Mnemonics: Aldehydes, Ketones and Carboxylic Acids
Named Reactions
Mnemonic: "Real Students Enjoy Good Coffee With Amazing Cookies."
| Word | Reaction |
|---|---|
| Real | Rosenmund reduction |
| Students | Stephen reaction |
| Enjoy | Etard reaction |
| Good | Gattermann-Koch reaction |
| Coffee | Clemmensen reduction |
| With | Wolff-Kishner reduction |
| Amazing | Aldol condensation |
| Cookies | Cannizzaro reaction |
Reaction Order
STEPS
1. Is it aldehyde or ketone?
2. Is α-hydrogen present?
3. Is it methyl ketone?
4. Then choose reaction:
- α-H → Aldol
- No α-H → Cannizzaro
- CH₃CO- → Haloform
Mnemonic: N(N)AACH (dance)
Add → Reduce → Oxidize → Alpha → No Alpha → Methyl
| Word | Reaction |
|---|---|
| Add | Nucleophilic addition reactions |
| Reduce | NaBH₄ / LiAlH₄ reduction |
| Oxidize | Aldehyde → acid |
| Alpha | Aldol condensation |
| No Alpha | Cannizzaro reaction |
| Methyl | Haloform reaction |
1. Add
Mnemonic: "CHON Attacks Carbonyl"Carbonyl carbon is electrophilic, so nucleophiles attack it.
So remember: C, H, O, N nucleophiles attack the carbonyl.
| Letter | Reagent |
|---|---|
| C | CN⁻ (HCN) → Cyanohydrin |
| H | HSO₃⁻ → Bisulphite compound |
| O | ROH → Acetal |
| N | NH₂OH / NH₂NH₂ → Oxime / Hydrazone |
2. Reduce
Mnemonic:"NaLiH gives Alcohol."These reagents add hydrogen to C=O, converting it into alcohol.
C=O → CHOH
| Part | Meaning |
|---|---|
| Na | NaBH₄ |
| Li | LiAlH₄ |
| H | Hydrogenation |
3. Oxidize
Mnemonic: Tollens Finds Acid.
Aldehyde gets extra oxygen.
Reaction:
CHO → COOH
| Word | Meaning |
|---|---|
| Tollens | Tollens reagent |
| Finds | Detects aldehydes |
| Acid | Aldehyde → Carboxylic acid |
4. Alpha
Mnemonic: A makes A
Alpha Hydrogen Makes Aldol.
| Part | Concept |
|---|---|
| Alpha hydrogen | H on carbon next to C=O |
| Makes | Base removes this H |
| Aldol | Aldol condensation occurs |
5.No Alpha
Mnemonic: When NO Alpha-- Self Love ( Self reaction)If aldehyde has no α-hydrogen, it cannot do aldol.
Instead two molecules react with each other.
6.Methyl
Mnemonic: 3M
"Methyl Makes Mustard."
| Part | Concept |
|---|---|
| Methyl | CH₃CO- group |
| Makes | Reaction occurs |
| Mustard | Yellow iodoform ppt |
| Reaction | Trick to Remember |
|---|---|
| Addition | C=O → C-OH + Nu add nucleophile to C |
| Reduce | C=O → C-OH add H |
| Strong Reduce | C=O → CH₂ replace O with H |
| Oxidize | CHO → COOH add 1 OH |
| Aldol | 2 C=O → C-C-OH join two carbonyls |
| Cannizzaro | 2 CHO → COOH + CH₂OH one oxidized one reduced |
| Haloform | COCH₃ → COO⁻ + CHX₃ split CH₃ |
The document Mnemonics: Aldehydes, Ketones and Carboxylic Acids is a part of the NEET Course Chemistry Class 12.
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FAQs on Mnemonics: Aldehydes, Ketones and Carboxylic Acids
| 1. What are the key structural differences between aldehydes and ketones? |  |
Ans.Aldehydes contain a carbonyl group (C=O) at the end of the carbon chain, while ketones have the carbonyl group located within the carbon chain. This structural difference leads to variations in their chemical properties and reactivity.
| 2. How do you identify a carboxylic acid in a chemical structure? | |
Ans.A carboxylic acid can be identified by the presence of a carboxyl group (-COOH) in its structure. This group consists of a carbonyl (C=O) and a hydroxyl group (-OH) attached to the same carbon atom, which is characteristic of carboxylic acids.
| 3. What are some common reactions that aldehydes undergo? | |
Ans.Aldehydes commonly undergo several reactions, including oxidation to form carboxylic acids, reduction to form alcohols, and nucleophilic addition reactions, where they react with nucleophiles due to the electrophilic nature of the carbonyl carbon.
| 4. What mnemonic can help remember the functional groups of aldehydes, ketones, and carboxylic acids? | |
Ans.A useful mnemonic is "A Kid Can Always" where "A" stands for Aldehydes, "K" for Ketones, "C" for Carboxylic acids, and "A" for their functional groups: -CHO, -C(=O)-R, and -COOH respectively. This helps in recalling their names and structures.
| 5. Why are carboxylic acids considered more acidic than alcohols? | |
Ans.Carbocylic acids are more acidic than alcohols because they can donate a proton (H+) more readily due to the resonance stabilization of the carboxylate ion formed after deprotonation. In contrast, alcohols do not have similar resonance stabilization, making them weaker acids.
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