Imagine rafting with a group of friends along a winding river on a hot summer day. At noon, the group decides to take a lunch break. Everyone jumps out and helps to pull the raft on shore. Its very hot, so your friends find a shady spot a few yards away to eat lunch. Later, when you return to the raft, you are dismayed to find that the raft burst while sitting in the sunlight. What caused the raft to burst?

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.