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Aldehydes, Ketones & Carboxylic Acids in One Shot Video Lecture - One-Shot
FAQs on Aldehydes, Ketones & Carboxylic Acids in One Shot
| 1. What are the key differences between aldehydes and ketones? |  |
Ans. The primary difference between aldehydes and ketones lies in their structural features. Aldehydes have the functional group -CHO, where the carbonyl group (C=O) is located at the end of the carbon chain. In contrast, ketones contain the carbonyl group within the carbon chain, represented as -C(=O)-. Additionally, aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl carbon, which makes them more susceptible to oxidation.
| 2. How do carboxylic acids differ from aldehydes and ketones in terms of acidity? | |
Ans. Carboxylic acids are more acidic than both aldehydes and ketones due to the presence of the carboxyl group (-COOH). This functional group can donate a proton (H⁺) to a base, allowing carboxylic acids to exhibit acidic properties. In contrast, aldehydes and ketones lack this ability to donate protons, making them neutral in nature. The resonance stabilisation of the carboxylate ion formed when a carboxylic acid donates a proton further contributes to its acidity.
| 3. What are some common reactions involving aldehydes and ketones? | |
Ans. Common reactions involving aldehydes and ketones include nucleophilic addition reactions, where nucleophiles attack the carbonyl carbon. Aldehydes readily undergo oxidation to form carboxylic acids, while ketones are generally resistant to oxidation. Both can participate in reduction reactions to form alcohols. Additionally, aldehydes can undergo aldol condensation, leading to the formation of β-hydroxy carbonyl compounds, while ketones can participate in similar reactions under appropriate conditions.
| 4. Can you explain the mechanism of the nucleophilic addition reaction of aldehydes? | |
Ans. The nucleophilic addition reaction of aldehydes begins with the nucleophile attacking the electrophilic carbon atom of the carbonyl group (C=O). This leads to the formation of a tetrahedral intermediate. The oxygen atom carries a negative charge and can subsequently protonate by a solvent or an acid, resulting in the formation of an alcohol. This mechanism highlights the electrophilic nature of the carbonyl carbon and illustrates how aldehydes can react with various nucleophiles to form different products.
| 5. What are some methods for the synthesis of carboxylic acids? | |
Ans. Carboxylic acids can be synthesised through several methods, including the oxidation of primary alcohols or aldehydes, which converts them into carboxylic acids. Another method involves the hydrolysis of nitriles, where nitriles react with water in the presence of an acid or base to yield carboxylic acids. Additionally, carboxylic acids can be produced through the carbonylation of alcohols or phenols, where carbon monoxide is introduced to form the carboxylic acid functional group.
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Apr 18, 2026 Last updated
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