If the chromic acid oxidation is performed with stoichiometric oxidant in the presence of diethyl ether as co-solvent (a method introduced by H.C. Brown), the epimerization of l-menthone to d-isomenthone is largely avoided.
Apple cider vinegar isn't likely to be effective for weight loss. Proponents of the apple cider vinegar diet claim that drinking a small amount of apple cider vinegar before meals or taking an apple cider vinegar supplement helps curb appetite and burn fat. However, there's little scientific support for these claims.
As with beans, apples are an excellent source of LDL-lowering soluble fiber, primarily pectin. Research published in December 2014 in the European Journal of Nutrition also shows that eating an apple a day (or better yet, two) can slow the oxidation of LDL cholesterol.