What happens to the number of carbon atoms in the carbon chain molecules as they go through the Krebs cycle

Also during the Krebs cycle, the two carbon atoms of acetyl-CoA are released, and each forms a carbon dioxide molecule. ... Two acetyl-CoA molecules enter the cycle, and each has two carbon atoms, so four carbon dioxide molecules will form.

No that answer is wrong. you have written the function of mitochondria in chloroplast and function of chloroplast in mitochondria.