In 1,2,3 the acidic -H order is 1,>2,>3

$1,3-\mathrm{\text{D}}\mathrm{\text{i}}\mathrm{\text{k}}\mathrm{\text{e}}\mathrm{\text{t}}\mathrm{\text{o}}\mathrm{\text{n}}\mathrm{\text{e}}\mathrm{\text{s}}$ are prone to exist as enols because of conjugation of the enol or enolate with the other carbonyl group, and the stability gained in forming a six-membered ring.