2.6 Halogenoalkanes

Question 1

What is the trend of EN / bond polarity in a halogenoalkane?

Answer 1

Decreases as the halogen size decreases. So C-Cl is most polar

Question 2

What’s the order of the halogens from most reactive to least reactive?

Answer 2

Iodo , Bromo, Chloro

Question 3

What happens to each halogen upon addition of AgNO3?

Answer 3

Chlorine: white pptt
Bromine: cream pptt
Iodine: yellow pptt

Question 4

What happens to each halogen upon addition of NH3?

Answer 4

Chlorine: Dissolves in dilute NH3
Bromine: Dissolves in concentrated NH3
Iodine: Does not dissolve

Question 5

Recall what makes up the distillation apparatus

Answer 5

Bunsen burner, Round bottom flask, Fractioning column, Thermometer, Condenser and a Conical flask

Question 6

What are the uses of halogenoalkanes?

Answer 6

1. Solvents (polar molecules but insoluble in H2O)
2. Refrigerants (easily vapourised so they cool surroundings and they’re non-toxic)
3. Anaesthetics (CHCl3 is chloroform)