Alkene reactions Flashcards
1
Q
Electrophilic reaction
A
- electrophile attacking C=C electron rich area
2
Q
Electrophile
A
- electron deficient
- accept electron pairs from nucleophile
- +ve charged
- Lewis acids
3
Q
Why are alkenes susceptible to electrophile attacks?
A
- loosely-held pi electrons in C=C bonds
4
Q
Electrophilic addition reaction
A
- double bond converted to single bond
- give rise to a single product
5
Q
Halogenation (Electrophilic addition of halogen)
A
- Test for unsaturation
Reagent: Br2 in CCl4 (or other inert organic solvent)
Condition: r.t.p and in the dark
Observation: Decolourisation of reddish brown bromine
End product: dibromopropane
6
Q
Hydrohalogenation
A
- Conversion to halogenoalkane
Reagent: HBr
Condition: Heat
7
Q
Hydrogenation
A
- Conversion to alkane
Reagent: H2, Ni catalyst
Condition: Heat
End product: Propane
8
Q
Hydration
A
- conversion to secondary alcohol
- Reagent: H2O (g), H3PO4 cat.
- condition: 300 degrees, 60-70 atm
- end product: Propan-2-ol
