question about polarity of functional groups

[patricklin27]

---

Members don't see this ad.

why are carboxylic acids more polar than aldehydes/ketones?

and why are amides more polar than carboxylic acids?

thanks

 

[Qtn2x]

i could only answer your first question. C. acids are more polar than ketones and aldehydes because they contain hydrogen bond within the molecule (O-H) while ketones and aldehydes don't.

I am still looking for the answer for the second question. Some said amides are more polar and some say they are not. I am confused about this one and I hope someone in here can answer that question.

 

[MAdental]

and why are amides more polar than carboxylic acids?

thanks

Breakdown the structure. Carboxylic acid has 2 Oxygens VS Amide having an O and a N.
which is more electronegative ? N or O ?
I think you have your answer.

 

[Illfavor]

i could only answer your first question. C. acids are more polar than ketones and aldehydes because they contain hydrogen bond within the molecule (O-H) while ketones and aldehydes don't.

I am still looking for the answer for the second question. Some said amides are more polar and some say they are not. I am confused about this one and I hope someone in here can answer that question.

Also, CO2H is more polar because it has more electron withdrawing groups.

For the second question, the two resonance stabilized oxygens in a carboxylic acid compete equally for electrons, effectively reducing the dipole. An amide has two electronegative groups of differing electronegativities competing, so one is more polar than the other.