Major and Minor Resonance Contributing Structures - Orgo Basics Vid 7

leah4sci.com/or... presents: Orgo Basics Video 7 - Identifying major and minor resonance contributing structures in organic chemistry
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Video 7 in the Orgo Basics series shows you how to draw and identify major and minor resonance contributing structures in organic chemistry. This video shows you how to recognize the impact of a complete or incomplete octet, electronegativity of the atom holding a charge, and how to look at multiple charges or separation of charge.
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[@rayanrodrigues7754]

It's so weird why would they form some structures when clearly they could be happy as a neutral molecule without the need for resonance haha.

[@Leah4sci]

Electrons are always moving and so the resonance hybrid (the in between) will closer resemble the 'happy' neutral structure

[@rayalmeida1356]

5-6 = (-1) . You wrote 1.

[@Leah4sci]

You're correct. That would be a mistake on my part in the text. The audio says -1, but the text does not reflect that. Thank you for pointing that out!

[@jerrygarza3941]

Molecules feel emotions, mind blown. J/k thanks for the videos! They make me happy/stable.

[@Leah4sci]

Glad you like them!

[@01mahimajerushasingh74]

Hey Leah, Thankyou for all your help in chemistry, u've evoked love for chemistry, ur a brilliant teacher and may God Bless You.. :-) :-)

[@Leah4sci]

Oh wow, I'm so glad to have passed along a love for the topic!

[@jaleihquintero8504]

thank you so much leah because of you ill pass my orgo exam!!!!

[@Leah4sci]

You're very welcome, happy to help!

[@jasmineboss7151]

the explanation is soo awesome leah

[@Leah4sci]

Glad you like it!

[@MsBeastly1236]

Thank you so much for making these videos Leah! They help so much!!

[@Leah4sci]

You're very welcome, happy to help!

[@maximillianjacob8244]

The last example on Acetate has more than two charges. Shouldn't that be considered insignificant?

[@Leah4sci]

At which specific point in the video?

[@SMM-xg7dn]

4:01 How does O on the left have a full octet with 5 valence electrons? If the electrons move onto the O it will have a full octet/valency of 6.....but then the carbon would not have a valency of 4 or full octet? Please help

[@splashboi898]

Oxygen has a full octet on the left, 4 from pi bind and 2 from the sigma and it has 2 electrons from the lone pair = 8 electrons. The formal charge however is +1 or (6-(3+2)). If you make the double bond into a single bond moving those electrons to oxygen carbon does not have a full octet because there is only 3 bonds and 6 electrons for carbon. While oxygen has a neutral formal charge (after moving the electrons) since carbon doesn't have a full octet that resonance structure is not the best

[@Leah4sci]

When counting electrons for the octet rule, you count not only the atom's own electrons but ALSO the ones that are being shared with that atom in a bond. You are counting the TOTAL number of electrons for the atom.

[@PleasanceLiddle]

So Acetate actually has 3 resonance structures, and not 2 like how was shown in the first example?

[@PleasanceLiddle]

When I google it says Acetate has 2 but the one without a double bond (in the last example of this video makes sense too so I'm very confused)

[@Leah4sci]

technically yes, you can show a resonance form that has complete separation of charge and zero pi bonds, however that is considered so unstable that most professors do NOT ask for this to be one of your contributing structures. Separation of charge is too unstable and so ideally the pi electrons exist AS a pi bond with either oxygen giving you the 2 resonance forms

[@Mr921doglover]

I enjoy your videos. Thank you so much!!!]

[@Leah4sci]

You are so welcome!

[@Jimothy101]

at 7:47 why isnt resonance a pi bond ? you put a lone pair

[@Leah4sci]

the pi bond collapses downward putting both former pi electrons together as a lone pair onto carbon

[@judeenwereji1038]

Thanks ur video on basity/neuclophility.made d topic more easy.

[@Leah4sci]

You're very welcome, happy to help!

[@sauravpandey7459]

Best video. thank u.🙏🙏🙏🙏🙏

[@Leah4sci]

You're welcome! :)

[@hadeerrashad5486]

I cannot thank you enough!!!!!

[@Leah4sci]

You're very welcome!

[@tiffanymukundi1030]

Thank you so much Leah

[@Leah4sci]

You are so welcome!

[@JohnAdrianUrbano]

Wieeeeee. Thanks to thissss! :D

[@Leah4sci]

You're so welcome!

[@925LY]

Leah4President

[@Leah4sci]

Politics are too messy, how about I just stick with science instead?

[@thomaskosten3012]

thank you!

[@Leah4sci]

You're welcome!

[@aniketsingh8758]

Awesome!

[@Leah4sci]

Thanks!

[@sagacioussolace7827]

awesome mam:)))))))

[@Leah4sci]

Glad you like it!

[@loithanoo]

thank you so much !

[@loithanoo]

Yes I am :)

[@loithanoo]

***** Yes, this is my first OChem class :)

[@loithanoo]

I am working on SN1, SN2, E1,E2 ,addition mechanisms and IR, HNMR and CNMR right now :)

[@Leah4sci]

You're so very welcome!

[@sohamostafa3248]

❤️❤️❤️

[@Leah4sci]

Glad you liked it!

[@sohamostafa3248]

@@Leah4sci Great explanation

[@nutrisheddietitian6985]

Great instruction! Thank you :)

[@Leah4sci]

You're very welcome!