Occasionally, chemists need to invert the stereochemistry of an alkene?that is, to convert a cis alkene to a trans alkene, or vice versa. There is no one-step method for doing an alkene inversion, but the transformation can be carried out by combining several reactions in the proper sequence. How would you carry out the following reactions?

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5 cis-5-Decene (a) trans 5-Decene (b) cis-5-Decene trans-5-Decene