Is an aldehyde acidic or basic?

Because of resonance stabilization of the conjugate base, an α-hydrogen in an aldehyde (not shown in the picture above) is far more acidic, with a pKa near 17, compared to the acidity of a typical alkane (pKa about 50).Click to see full answer. Consequently, is a ketone acidic or basic?Ketones are also weak bases, undergoing protonation on the carbonyl oxygen in the presence of Brønsted acids. Ketonium ions (i.e., protonated ketones) are strong acids, with pKa values estimated to be somewhere between –5 and –7.Furthermore, are aldehydes or alcohols more acidic? the electron donating ability and the stability of the conjugate base. The stronger the acid, the weaker the conjugate base. So, while aldehydes, alcohols, and water all have pKa values of about the same, on average, water is the most acidic. Ketones are the least acidic. In this manner, are aldehydes or ketones more acidic? Acidity of aldehydes and ketones and enolate formation. In most academic courses you’d learn that aldehydes are more acidic (lower pKa) than ketones due to the lower electron donating effect of the proton compared to the alkyl group of the ketone.Which is more acidic aldehyde or carboxylic acid?Carboxylic acids generally have pKas in the range of 3 – 5, and therefore are weaker acids than hydronium ion (H3O+), but they are stronger acids than other organic acids, such as alcohols (16 – 20), aldehydes and ketones (18 – 22), alkynes (25), benzene (35) or alkanes (50).