Determine polarity

[kabtq9s]

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Guys why is the product of this reaction more polar than the reactant ?

Also I'm using Princeton review and I could not find a topic in the orgo section about polarity could some 1 tell me where to look ?

Thanks in advance

 

[cheesier]

This question has come up before and there doesn't seem to be a great explanation, but basically, there is a substantial difference in electronegativity between Oxygen and Hydrogen which is much greater than Oxygen and Carbon. In the alcohol, the electron from the hydrogen is drawn very close to the oxygen and the one from the carbon is to some extent as well. In the ketone, there is no hydrogen "donating" (probably not the best word) an electron to oxygen, so the partial negative charge on the oxygen is not as great. But tbh, this is probably a good thing to just memorize.

 

[movax]

Guys why is the product of this reaction more polar than the reactant ?

Also I'm using Princeton review and I could not find a topic in the orgo section about polarity could some 1 tell me where to look ?

Thanks in advance

I think it is because the dipole moment between O and H is bigger than the dipole moment between O and C (greater difference in electronegativity).

No idea if knowing that it's a reduction of a ketone to a secondary alcohol helps at all.

 

[kabtq9s]

Thanks guys,

This only makes sense to me when I think of it in terms of electronegativity as you guys mentioned.

I guess I will just memorize it that way.😉