REPORT FORM: ACID-BASE EXTRACTION OF BENZIL AND BENZOIC ACID Mass of original benzil/benzoic acid mixture: g Observed melting-point range of original benzil/benzoic acid mixture: oC Mass of recovered benzil: g Mass recovery of benzil: % Literature melting-point range of benzil: oC Observed melting-point range of recovered benzil: oC Mass of recovered benzoic acid: g Mass recovery of benzoic acid: % Literature melting-point range of benzoic acid: oC Observed melting-point range of recovered benzoic acid: oC

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.