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There are some questions in the middle part of the presentation so have a pen and paper ready.

Electrophilic addition reactions of alkenes. There are some questions in the middle part of the presentation so have a pen and paper ready. There is some narration so turn the sound on!. Electrophilic addition. Ethene and bromine liquid at room temperature. H. H. C. C. H. Electrophile.

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There are some questions in the middle part of the presentation so have a pen and paper ready.

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  1. Electrophilic addition reactions of alkenes. There are some questions in the middle part of the presentation so have a pen and paper ready. There is some narration so turn the sound on!

  2. Electrophilic addition. Ethene and bromine liquid at room temperature.

  3. H H C C H Electrophile H Polarised Brδ+ Brδ-

  4. Carbocation H H H H C C C C + H H H H Brδ+ Br δ+ Brδ- Brδ- __ Curly arrows

  5. H H H H C H H C C H H C + + Br Brδ+ Brδ- __ Bromide ion Brδ- __

  6. H H Electrophilic addition C H H C Br Br Saturated 1,2-dibromoethane Unsaturated

  7. H H H H C C H H C H H C H H + Brδ+ Br C H H C Brδ- Brδ __ H H Br Br C H H C + Br Brδ __ Mechanism

  8. Write down the answers to the questions on a piece of paper. You will be given the answers in the final part of the presentation.

  9. Electrophilic addition. Ethene and bromine liquid at room temperature.

  10. H H C C H H Brδ+ Brδ-

  11. H H H H C C C C + H H H H Brδ+ Br δ+ Brδ- Brδ- __

  12. H H H H C H H C C H H C + + Br Brδ+ Brδ- __ Brδ- __

  13. H H C H H C Br Br

  14. Q1. From red-brown to colourless (not clear). Ethene and bromine liquid at room temperature.

  15. Q2. Ethene is unsaturated because it has a double bond between carbon atoms. H H C C H H Q3. The δ+ end of the Br2 acts as an electrophile Brδ+ Brδ-

  16. Q5. The carbon only has a single + charge because only one of the shared pair of electrons belonged to this carbon. H H H H C C C C + H H H H Brδ+ Br δ+ Brδ- Brδ- __ Q4. There is a single – charge because one of the shared pair of electrons already belonged to this bromine.

  17. Q6. A carbocation. H H H H C H H C C H H C + + Br Brδ+ Brδ- __ Q7. Curly arrows represent movement of a pair of electrons. Brδ- __

  18. H H Q8. The product is saturated. All the bonds between carbon atoms are saturated. C H H C Br Br Q9. 1,2-dibromoethane Q10. Electrophilic addition.

  19. Well done!

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