In what organelle would you find acetyl CoA formation, the citric acid cycle, and the electron transport chain?

In mitochondrion

Mitochondrion is a spherical or ovoid shaped membrane-bound organelle that is located in the cytoplasm of almost all eukaryotic cells (cells with true nucleus). Mitochondrion is responsible for cellular respiration and production of large quantities of energy in the form of adenosine triphosphate (ATP) within the cell. Acetyl CoA formation, the citric acid cycle, and the electron transport chain which are steps of cellular respiration all occur in the mitochondrion.