Reactivity due to pi-electrons is present in_________________?
Correct answer: D. both B & C
- A. alkane
- B. alkene
- C. alkyne
- D. both B & C
Explanation
Both alkenes and alkynes contain pi bonds, and their exposed pi electrons make them more reactive than saturated alkanes in addition reactions. Students may choose only alkene because it is the most familiar unsaturated hydrocarbon, but an alkyne also contains pi electrons.
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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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