Alkenes are produced from dehalogenation of________________?
Correct answer: C. vicinal dihalo alkane
- A. dihalo alkane
- B. trihalo alkane
- C. vicinal dihalo alkane
- D. vicinal trihalo alkane
Explanation
Dehalogenation of a vicinal dihaloalkane removes halogen atoms from adjacent carbon atoms, allowing a carbon-carbon double bond to form and producing an alkene. The likely mistake is choosing a general dihaloalkane, but the halogens must be on neighbouring carbons for this direct elimination to give the expected alkene.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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