Alkyl halides

Question 1

What is an alkyl halide?

Answer 1

Organic molecule containing a halogen

Question 2

What happens to size of atoms down the periodic table?

Answer 2

Get bigger

Question 3

Is there a dipole in the C-X bond?

Answer 3

Yes permanent dipole

Question 4

Why is there a permanent dipole in the C-X bond?

Answer 4

Because X is much more electronegative so pulls electrons towards itself creating slight negative on one side

Question 5

Whats stronger permanent dipoles or London dispersion forces?

Answer 5

Permanent dipoles, London is just induced-induced

Question 6

Facts about C-X bond…

Answer 6

Polarised (permanent dipole)
Bond strength decreases down g7 as groups get bigger
Higher m/b points than alkanes since g7 has bigger molecular surface area which London dispersion is dependent on

Question 7

Why do alkyl halides have higher m/b points than alkanes?

Answer 7

Halogens give molecule bigger molecular surface area, means London dispersion forces can form stronger attractions so more energy needed to m/b

Question 8

What has higher m/b points alkanes or alkyl halides?

Answer 8

Alkyl halides since bigger surface area= more London dispersion= more energy to break