Electrophilic Substitution, Benzene Mechanism - Organic Chem

[@timothychan5]

Keep up the good work!! 👍 clear and concise online tuition 👍

[@ChemistryGuru]

Thank you for the encouragement! Yes gonna keep producing more videos! 💪😁

[@gokulram9188]

I am so shocked you havent even reached 10 thousand subscribers ! Your videos are just CRYSTAL clear ! You deserve much more subscribers and wish you the very best my friend !

[@msfollower2001]

You are so clear and concise, you’re an amazing teacher and I hope you know that your videos really help students !

[@ChemistryGuru]

Thank you Jess! Glad you found them useful 😊😊

[@nicelookhairsalon4089]

God bless you sir for this transparent explanation

[@isratjahanmuskan6038]

Thanks FOR class

[@chefhamzawyyummy5995]

electrophilic substitution all reactions have the same general mechanisms ?

[@ChemistryGuru]

this should only apply to benzene. other functional groups that undergo electrophilic substitution will have different steps

[@葉赫那拉榮禹]

Excellent! Now, would u b able to show me the mechanism of addition reaction of acidified aqueous potassium manganate(VII) into ethene to produce ethane-1,2-diol

[@ChemistryGuru]

Hi the reaction of alkene to di-ol via KMnO4 is a mid oxidation. Mechanisms of redox reaction is not covered in A Level Chemistry so I will not be going through that. 😀

[@pavitrapadmanathan5637]

extremely helpful teacher.

[@jaydenong153]

Hi, do you know where does the 2 electrons come from when the intermediate loses the H+ ion? Thank you

[@ChemistryGuru]

Hi Jayden if you are referring to step 3 for electrophilic substitution, when the intermediate loses the H+ to form product, the 2 electrons come from the C-H covalent bond. Both electrons from the C-H bond will be donated to the delocalised pi system so there will be 6 delocalised electrons (where resonance is the most stable). Then H+ is being kicked out and combine with other intermediates to form by-products.

[@jaydong9985]

Chemistry Guru - #1 JC, A Level, H2 Chemistry Tuition ohhh okay but why is it specifically 2 electrons?

[@ChemistryGuru]

@@jaydong9985 in step 2, 2 electrons from delocalised pi system in benzene is used to form a bond with carbon and electrophile. The pi system is then short of 2 electrons, so in step 3 it will take back 2 electrons to restore the delocalisation.

[@neoretrodude]

Very good :)

[@ChemistryGuru]

Thanks for the compliment! 😊

[@manpritkaur9102]

Nice

[@ChemistryGuru]

Thank you!

[@SeratalRakib]

thank you so much!