One of my homework questions is that i have to put the bonds C-l, C-H, C-Cl, C-O, C-F, C-Br in order of polarity with the most polar bond.
Im having a bit of difficulty figuring out what rule to use for this. I have a table of electronegativity values and began by finding the difference between the electronegativty values of the elements in the bonds but i have the answers and this method is wrong. Any help please?
The bigger the difference in EN, the greater the polarity of the bond.
C-I = 2.66 – 2.55 = 1
C-H = 2.55 – 2.2 = 0.35
So C-I is more polar than C-H
The bigger the difference in EN, the greater the polarity of the bond.
C-I = 2.66 – 2.55 = 1
C-H = 2.55 – 2.2 = 0.35
So C-I is more polar than C-H
References :
The largest difference = most polar.
References :
ok, instead of looking at electronegetivity table, use this rule:
electronegetivity, electron affinity, and electron ionization energies increase from bottom to top and left to right.
atomic radius, however, increases from top to bottom and right to left.
With that said, locate the halogens, located in group 7 and apply this rule.
In order of decreasing electronegetivity, or decreasing polarity:
C-F>C-Cl>C-Br>C-I>C-O>C-H
Also, when a certain element is more electronegetive, it pulls the electrons towards itself, generating polar charges. Since fluorine is more electronegetive, when it bonds with carbon, carbon becomes slightly positive and F becomes slightly negetive.
hope this helps.
References :
BS in biology
mcat student