Bond Lengths

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Bond Lengths

Postby Rose_Malki_3G » Sun Nov 15, 2020 9:11 pm

In the #4 of the sapling assignment, it gives us a table of expected bond lengths and also informs us of the observed bond lengths. It then asks us to chose the correct statement about the lewis structure and bond lengths. In the answer options it says "the carbon–nitrogen bond has ample C=N bond character." What does it mean by ample? And how would this compare to something with overwhelmingly C−O bond character?

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Re: Bond Lengths

Postby IreneGi2I » Sun Nov 15, 2020 9:50 pm

In this case, the expected C-O single bond length is 143pm and C=O double bond length is 112pm. Since the observed bond length of C-O is 128pm, it indicates that the bond between C and O has the intermediate length between the single bond and double bond.

If C-O has overwhelmingly single bond character, then the observed bond length would have been very close to 143pm. However, 128pm is not very close to 143pm. Therefore, we can say that carbon-oxygen bonds have 'ample' C=O bond character. "Ample" just means "enough", so the statement is basically saying that the carbon-oxygen bonds have enough C=O bond character.

Hope this helps!

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