Compared to aldehydes, ketones are generally considered to be:

Ketones are generally considered to be less acidic than aldehydes due to the presence of additional alkyl groups attached to the carbonyl carbon in ketones. In aldehydes, the carbonyl group (C=O) is bonded to one alkyl group and one hydrogen atom. In contrast, ketones have two alkyl groups attached to the carbonyl carbon.

The presence of these alkyl groups in ketones can have an electron-donating effect through hyperconjugation and inductive effects, which destabilizes the corresponding conjugate base (the alkoxide ion formed after deprotonation) relative to that of aldehydes. The additional alkyl groups in ketones increase the electron density around the carbonyl carbon, making it less favorable for the compound to lose a proton compared to aldehydes, where the electron-withdrawing hydrogen allows for greater stabilizing resonance in the conjugate base.

This fundamental understanding of the structure and electronic effects in aldehydes and ketones is what distinguishes their acidity levels when comparing the two functional groups.