Most & Least Strongest & Weakest Bond - C-F, Si-F, C-O, Si-O, C=O, Si=O, Si-C, Si=C?

Of the following list:


C-F, Si-F, C-O, Si-O, C=O, Si=O, Si-C, Si=C


Identify:


a) most polar bond (Si-F)


b) least polar bond (Si-C)


c) strongest single bond (Si-F)


d) weakest single bond (Si-C)


e) strongest double bond (C=O)


f) weakest double bond (Si=C)





I have the answer to the problems, but I'm having hard time figuring out which one is which. Is there a trend in the periodic table that will help me pick correct answer? What should I be looking at? Polarity?





Thank you.

Most %26amp; Least Strongest %26amp; Weakest Bond - C-F, Si-F, C-O, Si-O, C=O, Si=O, Si-C, Si=C?
You should be looking at electronegativities of each element. Electronegativity increases as you go up a group and increases as you go from left to right of the period table.





Because Si and F would have the largest difference in electronegativities, it would have the most polar bond, because of the differences in the partial positive and negative charge of the cation and anode. This also corresponds to the strong single bond (strong bond interactions).





The least polar bond would be Si-C because Si and C have similar electronegativities and will thus show less polarity. This also corresponds to the weakest single bond, with weak bonding interactions.





The strongest double bond is C=O because the atomic radii of carbon is smaller than that of Si, so it will interact with oxygen more than Si, thus creating a stronger double bond.





The weakest double bond is Si=C because of the similar electronegativities, as above.





[Answer: see above]