Vitamin K is also a coenzyme.
Acetyl-CoA: CoA=Co-enzyme A; Coenzyme I, coenzyme II, coenzyme A and B-12 and coenzyme Q.
No, Zinc is an element not an enzyme.
Riboflavin is a vitamin (B 2); but riboflavin is a component of other biochemicals which act as coenzymes.
NAD FAD Coenzyme A
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