The correct order of the reactivity of hydrocarbon given below is:
Correct answer: A. C2H4 > C2H2 > C6H6
- A. C2H4 > C2H2 > C6H6
- B. C6H6 > C2H4 > C2H2
- C. C2H4 > C2H4 > C6H6
- D. C2H2 > C6H6 > C2H4
Explanation
In electrophilic addition reactions, the reactivity order is C2H4 (alkene) > C2H2 (alkyne) > C6H6 (benzene). Alkenes are more reactive due to the relative ease of forming a carbocation intermediate. Alkynes, though reactive, are less so than alkenes because of the stronger π bonds. Benzene is least reactive in addition reactions owing to its aromatic stability and resonance, making it favor substitution reactions over addition.
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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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