Question

Acetylation of ferrocene and column chromatography

Lab 4: Question 3 Homework • Unanswered Important ... The solvent is changed from petroleum ether to diethyl ether after the ferrocene is collected from the column. Why not use diethyl ether the entire time? Because diethyl ether is more polar than petroleum ether Because petroleum ether selectively elutes ferrocene since it contains more ether oxygens than diethyl ether Because diethyl ether would lead to a poorer separation of ferrocene and acetylferrocene Both a and c are correct A Submit 1 attempt left Unanswered

Answer 1

3) Ferrocene is less polar than acetylferrocene so ferrocene can be eluted using petroleum ether only as its less polar solvent and acetyl ferrocene can be eleuted by using diethyl ether as its more polar solvent.

So Ans is D

4) As ferrocene is less polar so it will be eleuted first using petroleum ether.

Ans D

5) When column is dry it would have cracks in it which would ruin the seperation

Ans is A

6) The key aspect of assembling the dry tube is to use porous material,to ensure dessicant material is free of moisture and dessicant material does not escape .

Ans D

7) Phosphoric acid is corrosive if it comes in contact with your skin.

Ans D

8) Both these ethers are highly flammable .

Ans D

9) Addition of water would inhibit electrophile

Ans C

10) Glassware should be rinsed with organic solvent to remove the solid impurities and acetone can usually be used .

Ans A