Mechanism of the Reaction Between Ethene and Bromine - Other Reactions
No description yet. This curated deck is ready for daily study.
Card preview (7)
This mechanism also stands for the addition of what to ethene?
Cl2 and HCl
This mechanism also stands for the addition of Cl2 and HCl to what?
Ethene
Describe how the mechanism occurs in the case of Cl2. 5
Polarisation of the Cl-Cl bond occurs as a result of the repulsion caused by the electrons in the double bond Heterolytic fission occurs giving rise to Cl+ and Cl- ions The Cl+ species attacks the C=C double bond first and then forms a bond with one of the carbon atoms This leaves the other carbon atom positively charged (carbonium atom) The Cl- ion attacks the carbonium ion to form 1,2-dichloroethane
Describe how the mechanism occurs in the case of HCl. 5
Increased polarisation of the already polar HCl bond occurs, as a result of repulsion by the electrons in the double bond (of ethene) This leads to heterolytic fission forming H+ and Cl- ions The H+ ions attacks the C=C double bond first and forms a bond with one of the carbon atoms This leaves the other carbon atom positively charged (carbonium ion) The Cl- ion then attacks the carbonium ion to form chloroethane
Why is there no evidence for the formation of a cyclic intermediate in the case of the addition of HCl to ethene?
This is because the H atom is too small to form a ring compound
There is no evidence for the formation of a cyclic intermediate in the reaction between what and ethene?
HCL
What cannot be formed in the reaction between HCL and ethene?
A cyclic intermediate