Identifying electron donors vs electron withdrawers (6C 21)

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Nathan Nakaguchi 1G
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Joined: Wed Sep 18, 2019 12:22 am
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Identifying electron donors vs electron withdrawers (6C 21)

Postby Nathan Nakaguchi 1G » Fri Dec 06, 2019 11:25 am

I understand that electron withdrawers would make a molecule more likely to lose a proton and electron donors less likely to lose a proton. Like in 6C 21 how acetic acid is a weaker acid than formic acid since the methyl group -CH3 on the acetic acid is a electron donor to the molecule making it slightly less likely to give off a proton than formic. How can one identify when a molecule has either electron donors or electron withdrawers with it? How do you know that -CH3 is a electron donor while something like -CCl3 is an electron withdrawer?

Sanjana Borle 2K
Posts: 111
Joined: Fri Aug 09, 2019 12:15 am

Re: Identifying electron donors vs electron withdrawers (6C 21)

Postby Sanjana Borle 2K » Fri Dec 06, 2019 11:34 am

Basically electronegativity determines the electron withdrawing ability of atoms in a molecule, and therefore its acidity. So for the CH3 vs CCl3 example, since Cl is more electronegative, the Cl atoms pull the e- density closer to themselves, making the H easier to detach.


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