Acetoacetic ester behaves as

During the reaction of benzaldehyde with alkali,one of the products is:

In the reaction,the product $(X)$ is

Rank the following compounds in order of increasing value of the equilibrium constant for hydration,$K_{hyd}$. (smallest value first).
$1$: Cyclobutanone
$2$: Cyclopropanone
$3$: Di-tert-butyl ketone

The major product formed in the following reaction is:

Identify $A$ in the following reaction: