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Bond strength of molecules

Posted: Sun May 20, 2018 10:01 pm
by Chiara Berruto 1K
When given two molecules that each have varying numbers of both single and double bonds how do you find out which molecule has greater bond lengths?

Re: Bond strength of molecules  [ENDORSED]

Posted: Mon May 21, 2018 10:48 am
by Alexandra Wade 1L
If the molecule has resonance structures then the molecule with a greater number of double bonds will have shorter bond lengths. This is because with resonance structures the real bond length is a hybrid of both the single and double bonds (or any other combination), so structures with more double bonds will have overall bond lengths closer to the double bond length.