SN2 Reaction Energy Diagram

No video

SN2 Reaction Energy Diagram

Рет қаралды 24,986

Leah4sci

Күн бұрын

Пікірлер: 41

@keerthanasatheesh9639 3 жыл бұрын

You do realize you're a lifesaver for us Indians right? We have very high level engineering college entrance exams and we study what a college student in america would study in their whole course in our high school! Its too overwhelming for us and your website that organizes all the topics, along with the notes, the quizzes, its too fantastic! I've been trying to understand sn1,sn2,e1,e2 for the past whole month and you taught me in just two days :)

@Leah4sci 3 жыл бұрын

Wow, that's crazy! I'm so glad that my videos are a help to you!

@arupsingh345 3 жыл бұрын

Hello mam.. I m from India... I really impressed with your teaching technic .. keep it up ... thank dear...

@Leah4sci 3 жыл бұрын

Thanks and you're welcome!

@uddit748 4 жыл бұрын

Thanks for the effort

@Leah4sci 4 жыл бұрын

My pleasure

@JitenderKumar-fe4dk Жыл бұрын

Great explanation dear💯💯

@Leah4sci Жыл бұрын

Thank you!!

@manojmahato6823 4 жыл бұрын

Thanks ma'am for this video...l am from India and you..:🇮🇳🇮🇳🇮🇳🙂

@Leah4sci 4 жыл бұрын

My pleasure 😊

@raphaels6207 4 жыл бұрын

Thanks so much for this video! Really helped with understanding the kinetics of SN2. Just a quick question about E2, why do higher temperatures stabilize the pi bond between carbon attached to the leaving group and an adjacent carbon?

@Leah4sci 4 жыл бұрын

You're very welcome! I cover the E2 stability in the E2 videos on my channel

@pexaminer 2 жыл бұрын

Great video, as always!

@Leah4sci 2 жыл бұрын

Glad you liked it!

@summiyakhan2068 4 жыл бұрын

Good explanation thanks

@Leah4sci 3 жыл бұрын

You are welcome

@129354gabbie 3 жыл бұрын

yay

@Leah4sci 3 жыл бұрын

@Eric-sq4hd 4 жыл бұрын

this is great

@Leah4sci 4 жыл бұрын

Thanks!

@RoXon007 4 жыл бұрын

Miss tell me please how to remember these chemical reaction of alkanes,alkenes,alkynes alkyles,benzene,aldehydes,ketones etc its reation and preparations.tell me if you know any trick or method.

@Leah4sci 4 жыл бұрын

Try active writing to help with memorizing: leah4sci.com/memorize

@AkashDas-rl5vs 4 жыл бұрын

Thankiee

@Leah4sci 4 жыл бұрын

You're welcome!

@AkashDas-rl5vs 4 жыл бұрын

A lot of love from India....

@zaminahmed297 3 жыл бұрын

So why do both the CN and the Br have a negative charge in the transition state? I understand the Br because it is leaving and therefore becoming a negative charge but why does the CN have a negative charge? Wouldn't it be a neutral charge because it is making a bond with the carbon

@hunterhorsch5104 3 жыл бұрын

When you draw out CN in a lewis structure, both atoms have a lone pair and are triple bonded to each other. Looking at this, when you find the formal charge of both atoms, C = -1 while N = 0, thus making the molecule negative The formal charge formula can be expressed with; Formal charge = VE of atom - (Non binding electrons + number of bonds) Using carbon in this molecule as an example, Carbon 4 valence electrons, has 1 lone pair (2 electrons) and a triple bond (3 bonds) connecting to nitrogen. So, Formal Charge = 4 - (2 + 3) = -1 You can do this for nitrogen with the same steps N= 5 valence electrons FC = 5 - (2+3)= 0 =no charge In the transition state, they haven't so much bonded, but are in the middle of the reaction. You can still view them as separate entities floating around. A simplified way of thinking about these reactions are this; if you know you are working with either and SN1 or SN2 reaction, then you know that the reactant must have a halogen, the what it is reacting with must be a base. In SN2 reactions, the base must have a negative charge. When doing a SN2 reaction, the halogen will break off in the transition state, leaving the original reactant as an ion and leaving you with a negative Br and the still negative CN (because it hasn't connected yet). After the transition state, the base will attach itself to the reactant, at that point it will lose its negative charge and become neutral. TL:DR CN is still negative in the transition state because it hasn't connected yet. You can tell because in the transition state, the halogen is breaking off and leaving you with an anion. If the CN was connected in the transition state, then the transition state would be the end of the energy diagram because that is the product, but instead, the transition state is just the highest point of energy because it takes much more energy to separate atoms from their bonds than to attach them.

@zaminahmed297 3 жыл бұрын

@@hunterhorsch5104 Oh okay. Thank you is this the case with every transition state in SN2 or only in this specific example?

@zaminahmed297 3 жыл бұрын

@@hunterhorsch5104 Thanks for the explanation bro. Really cleared some things up

@Leah4sci 3 жыл бұрын

The cyanide ion has a negative charge on its carbon to begin with. Approaching the transition state of an SN2 reaction between methyl bromide and cyanide would create a partial bond between the two carbons, as well as a partial bond between the carbon and bromine. At this transition state, no atom is wholly negative. The carbon of CN would be partially negative as it begins to form its new bond, and the Br would be partially negative as it prepares to break its bond.