22. Which of the following does not contain at least one pi bond?
(A) $\text{H}_2\text{CO}$
(B) $\text{CO}_2$
(C) $\text{C}_2\text{H}_2$
(D) $\text{C}_3\text{H}_8$
(E) All of the above (A-D) contain at least one pi bond

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