tintinirs! From the choices given below, list the reagent(s) in the order needed to achieve the given transformations. List your answer as a single letter (single-step transformation) or a series of letters (multi-step transformation) with no commas separating them. For example, "hg". Note: The order in which you list your letters matters! (a) Starting with trans-2-butene, show how to prepare meso-2,3butanediol. (b) Starting with cis-2-butene, show how to prepare racemic 2,3butanediol