6th Edition #89 b

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6th Edition #89 b

Postby TiffanyL1G » Thu Nov 29, 2018 9:43 pm

What does the solution manual mean when it states "However, because C atom is involved in a double bond and the N single bond radius gives 142pm, which is close to the experimental value of 133pm"? I thought the bond length for CN would just be 77pm +75pm=152pm. Why does it suddenly talk about a double bond? Where did it come from?

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Re: 6th Edition #89 b

Postby Chem_Mod » Fri Nov 30, 2018 1:10 am

The double bond in the C=O shifts electron density to this bond away from the C-N bond. This makes the C-N bond shorter, hence 142 ppm, than what you would expect, your 152 ppm.

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