How can you differentiate an aldehyde from a ketone?

Answer 1

The Tollens test is probably the most useful discriminator. It certainly is the prettiest.

Although cyclohexanone does indeed give a positive test, an aldehyde can reduce silver nitrate to give a carboxylic acid and (under ideal conditions) a silver mirror coating the test tube bottom. Ketones, on the other hand, fail the Tollens' test because they cannot be further oxidized.

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Answer 2

Aldehydes and ketones can be differentiated based on the following characteristics:

  1. Functional Group: Aldehydes contain a carbonyl group (C=O) bonded to at least one hydrogen atom, while ketones contain a carbonyl group bonded to two carbon atoms.

  2. Nomenclature: Aldehydes are named with the suffix "-al" (e.g., formaldehyde, acetaldehyde), whereas ketones are named with the suffix "-one" (e.g., acetone, propanone).

  3. Chemical Tests: Aldehydes can be distinguished from ketones using various chemical tests such as Tollens' test, Fehling's test, or Schiff's test. Aldehydes undergo oxidation more readily than ketones and can be oxidized to carboxylic acids under mild conditions.

  4. Reactivity: Aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl group. This makes aldehydes more susceptible to nucleophilic attack and oxidation reactions compared to ketones.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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