Which of the following is the most reactive_________________?
Correct answer: C. ethene
- A. ethane
- B. ethyne
- C. ethene
- D. benzene
Explanation
Ethene is the most reactive among these choices under ordinary addition-reaction conditions because its carbon-carbon pi bond readily reacts while forming stronger sigma bonds. A student may choose ethyne because it has a triple bond, but the extra pi bonding does not make it more reactive than ethene in this comparison, while benzene is stabilised by aromaticity.
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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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