According to the general procedure of Experiment A2b, 213 mg of (E)-stilbene (180.25 g/mol) was reacted with 435 mg of pyridinium bromide perbromide (319.82 g/mol) to afford 342 mg of meso-stilbene dibromide (340.05 g/mol) as a white solid. Calculate the percent yield for this reaction. Enter your answer as digits only (no units), using the proper number of significant figures.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.