Stilbene Dibromide 1- Which caustic compound are we generating \"in situ\" in th

Question

Stilbene Dibromide

1-Which caustic compound are we generating "in situ" in this lab? This is why your reagents should only be mixed in the hood. Select one:

a. acetic acid

b. pyridine

c. stilbene dibromide

d. water

e. (E)-stilbene

f. bromine

g. pyridinium hydrobromide perbromide

2-What is the best reason why we should only use a little ice-cold methanol and water to wash our final product? Select one:

a. Pyridinium salts can react with room temperature methanol and water.

b. Methanol (also called wood alcohol) can blind us.

c. The product is more soluble in room temperature methanol-water.

d. The product can react with room temperature methanol and water.

Explanation / Answer

1) g. pyridinium hydrobromide perbromide is generated in situ in the lab.

2) a. Pyridinium salts can react with room temperature methanol and water. reaction in this case is the solvation of pyridium salt. wather methanol mixture solvates the pyridinium salt and wash it out from the crude product.

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