$A$ vitamin which plays a metabolic role in the conversion of pyruvic acid into acetyl $CoA$ is

When $1$ molecule of pyruvic acid passes through the process of the Krebs cycle,$a$ molecules of $CO_2$ are released and at $b$ different stages $2H^+$ and $c$ electrons are released. Identify $a, b, c$.

During which process is the majority of energy from carbohydrates released through oxidation?

Match the columns based on the number of carbon atoms in the compounds involved in the Krebs cycle:

Column-$I$	Column-$II$
$(a)$ $4$ $C$ compound	$(1)$ Acetyl $CoA$
$(b)$ $2$ $C$ compound	$(2)$ Pyruvate
$(c)$ $5$ $C$ compound	$(3)$ Citric acid
$(d)$ $3$ $C$ compound	$(4)$ $\alpha$-Ketoglutaric acid
	$(5)$ Malic acid

How many $ATPs$ can be made by $NADH$ when four pyruvic acids pass through the Krebs cycle?

In the Krebs cycle,$\alpha$-ketoglutaric acid is converted into malic acid. During this phase,how many $NADH$,$FADH_2$,and $ATP$ are formed?