Most Polar

[casper22]

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Which of the following is more polar?

A - C-Cl
B - C-O
C - C-Br
D - C-N


The answer says O is most electronegative of all...which I think is not correct

I know it is based on the largest difference in electronegativity...since 1st element is carbon the main electronegativity trend that matters is of the second element and based on the trend, isnt Cl the most electronegative?

What do you all think...

 

[HannibalLecter]

Which of the following is more polar?

A - C-Cl
B - C-O
C - C-Br
D - C-N


The answer says O is most electronegative of all...which I think is not correct

I know it is based on the largest difference in electronegativity...since 1st element is carbon the main electronegativity trend that matters is of the second element and based on the trend, isnt Cl the most electronegative?

What do you all think...

Nope...The more electronegative ion here is oxygen, if there was a fluorine that would be the only atom that could beat oxygen. Remember FON CL from BrSCH (phone call from Brisch)

 

[PhansterZ]

O is more electronegative than Cl.

Electronegativity is how much the atom wants the electrons in a shared bond.
The scale is relative to one another. Fluorine has the highest EN at 4.0 and all of the other atom's ability to 'pull' the electrons in a shared bond are relative to Fluorine.

O: 3.5
Cl: 3.0
N: 3.0
Br: 2.8

Since C has an EN of 2.5, the atom that will give it the largest EN difference is O. 3.5-2.5 = 1.0 EN difference.

A good way to memorize some simple EN values is FONCH (4, 3.5, 3, 2.5, ~2)

Hope that helps.

 

[jas1317]

i believe it is oxygen as well. chad stated i believe that the oxygen is more electronegative than the cl. (chad video 2.1 periodic trends)

 

[casper22]

Awesome...thanks all you guys..makes sense now...

 

[spoog74]

i believe it is oxygen as well. chad stated i believe that the oxygen is more electronegative than the cl. (chad video 2.1 periodic trends)

yeah my answer was down to either cl or o but o is the winner.

 

[AllahIsGreater]

in FONCH, what does the CH stand for??? which elements? doesnt make sense to be carbon and hydrogen