Alkenes undergo:
Correct answer: A. Electrophilic Addition
- A. Electrophilic Addition
- B. Electrophilic substitution
- C. Nucleophilic substitution
- D. Nucleophilic addition
Explanation
Alkenes have a pi bond between carbon atoms, which is an area of electron density i.e. a region of great negative charge, which attracts positively charged species, i.e. electrophiles, which add across the double bond without the removal of any atom/group of atoms. Hence, alkenes undergo electrophilic addition, option A. The remaining options describe reactions that are undergone by other organic compounds.Option B, electrophilic substitution is undergone by benzene.Option C, nucleophilic substitution is undergone by alkyl halides.Option D, nucleophilic addition is undergone by aldehydes and ketones.
This question appeared on the UHS MDCAT 2019 paper, which you can sit online with every answer explained.
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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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