Nitration Of Bromobenzene

Question 1

The reaction of bromobenzene

Answer 1

Bromobenzene + HNO3 —>(H2SO4) para and ortho nitrobenzene

HNO3 is nitric acid
Para is opposite and ortho is next to it

Question 2

Bromobenzene precaution

Answer 2

It’s flammable

Question 3

Nitrobromobenzene

Answer 3

Irritational

Question 4

Nitration reaction exothermic or endothermic?

Answer 4

Exothermic

Question 5

Why is the bromobenzene added I portions

Answer 5

Because the reaction is exothermic

Question 6

Why do you keep the reaction under 60°

Answer 6

The reaction should be kept under 60° because dinitration can occur a higher temperatures

Question 7

If you had seen two spots on your TLC strip which would have been the faster moving spot the ortho or the para isomer?

Answer 7

Para isomer is less polar this means the para isomer would have been the faster moving spot. Also have the larger Rf value.

Question 8

Why are you able to isolate the para isomer by recrystallization of the final product in Ethanol

Answer 8

We were able to isolate it because it is in insoluble in ethanol this is due to it being less polar as the dipoles cancel while the ortho isomer is soluble in ethanol

Question 9

During the recrystallization step you were told to allow the solution to cool slowly but what if you became impatient how would that affect the recrystallization process

Answer 9

It would cause impurities that are present to become trapped in the crystals of the pure compounds you want to be formed.