Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. use the letters a - j for your answers. proton transfer e = electrophilic addition h = sn1 nucleophilic substitution b = lewis acid/base f = e1 elimination i = sn2 nucleophilic substitution c = radical chain substitution g = e2 elimination j = electrophilic aromatic substitution d = radical chain addition

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

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.

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays