O3 reacts with CH2CH2 to form ozonide. On hydrolysis it forms
Correct answer: B. HCHO
- A. Ethylene oxide
- B. HCHO
- C. Ethylene glycol
- D. Ethyl alcohol
Explanation
Ozonolysis cleaves the C=C bond in ethene, CH2=CH2, and each carbon becomes a methanal molecule, HCHO, after hydrolysis of the ozonide. Thus one ethene molecule gives two HCHO molecules. Students may choose ethylene glycol because ethene can undergo other addition reactions, but ozonolysis is a cleavage reaction.
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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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