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Science Clinic => Chemistry => Topic started by: tashina2013 on Feb 17, 2022

Title: The CO absorption in carboxylic acids appears around 1250 cm-1. The CO absorption in an alcohol ...
Post by: tashina2013 on Feb 17, 2022

The C–O absorption in carboxylic acids appears around 1250 cm-1.  The C–O absorption in an alcohol appears around 1050 cm-1. Explain why.



◦ Only compound I has resonance, causing it to have a higher stretching absorption.
◦ Compound II has more possible resonance structures, increasing the single bond character of the carbonyl group.
◦ Compound I has a C to O bond with more single bond character than that of compound II, increasing the expected stretching absorption of the bond.
◦ Only compound II has resonance, causing it to have a higher stretching absorption.
◦ Compound I has more possible resonance structures, increasing the single bond character of the carbonyl group.

Title: The CO absorption in carboxylic acids appears around 1250 cm-1. The CO absorption in an alcohol ...
Post by: Marys on Feb 17, 2022

Only compound II has resonance, causing it to have a higher stretching absorption.

Title: Re: The CO absorption in carboxylic acids appears around 1250 cm-1. The CO absorption in an alcohol
Post by: Skdklsks on May 17, 2022

Thanks