Assuming the heterocyclic ring above to be planar: Give the number of electrons that are contributed to the pi system of the heterocyclic ring by:a. atom1 b. atom 2 c. atom 3 1) Enter NA for atom 3 if the structure above has only two numbered atoms 2) How many electrons are in the pi system of the heterocyclic ring? (In the case of fused rings add all the pi electrons.) 3) Is the heterocyclic ring with the numbered atoms aromatic?

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices