[Sona]

A cyclic diketone compound shows higher beta H acidity than the acyclic one. What is the reason for this?
As a ring is more rigid than an open chain, hence H s are fixed at a certain spatial position while due to the probability changinf conformation in open chain causes Hs less available.
Can this be explained like this?

[phth]

Fixed Antiparallel orientation with the diketo makes them more acidic.