Why are aldehydes more reactive than ketones?

Answer 1

Consider the shrubbery around the carbonyl group in an aldehyde, versus that around a ketone group.

Should we compare #RC(=O)H# to #RC(=O)R#, clearly the aldehyde is less sterically encumbered. Even for acetone versus acetaldehyde, the ipso carbon is encumbered by 2 methyl groups in the ketone, versus 1 methyl in the aldehyde.

Therefore, the aldehyde ought to be a far more reactive proposition in terms of sterics.

In terms of electronics, the aldehyde may be oxidized up a further step to give the carboxylic acid. Such oxidation is not available to a ketone, unless we break the #C-C# chain.
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Answer 2

Aldehydes are more reactive than ketones because aldehydes have a hydrogen atom attached to the carbonyl group, whereas ketones do not. This hydrogen atom makes the carbonyl carbon in aldehydes more electrophilic and susceptible to nucleophilic attack compared to the carbonyl carbon in ketones. Additionally, steric hindrance is generally lower in aldehydes due to the smaller alkyl groups attached to the carbonyl group, further enhancing their reactivity 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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