How many carbon atoms are present in Acetyl $CoA$?

$A$: Succinyl $CoA$ is the precursor of pyrrole group-containing compounds.
$R$: Succinyl $CoA$ is an intermediate of the $TCA$ cycle.

Which one is not correct about Krebs' cycle?

In which of the following steps of the Krebs cycle is $CO_2$ released?

How many $ATP$ molecules are produced during the oxidation of succinate to fumarate (in $ATP$)?

In $TCA$ cycle,how many reduced coenzymes are produced from one Acetyl $CoA$?