The organelle primarily concerned with the conversion of potential energy in organic compounds into a suitable form for immediate use by the cell is the mitochondrion.

Here's why:

* Mitochondria are often referred to as the "powerhouses of the cell" because they are responsible for cellular respiration.

* Cellular respiration is the process of breaking down glucose (a type of organic compound) in the presence of oxygen to produce ATP (adenosine triphosphate).

* ATP is the primary energy currency of cells, providing the energy needed for various cellular processes like muscle contraction, protein synthesis, and active transport.

So, while other organelles like chloroplasts (in plants) also deal with energy conversion, mitochondria are specifically responsible for converting the potential energy stored in organic compounds into the readily usable form of ATP for the cell.