Cyclobutane is obtained as the major product in
Question and options
Cyclobutane is obtained as the major product in
- photochemical activation of ethene
- thermal activation of ethene
- reaction of 1,2-dibromoethane with sodium metal in diethyl ether at high concentration
- reaction of 1,4-dibromobutane with sodium metal in diethyl ether at high concentration
Answer and explanation
Correct answer: A - photochemical activation of ethene
[2+2] cycloaddition of two ethene molecules is photochemically allowed (thermally forbidden), giving cyclobutane. Wurtz reaction of 1,4-dibromobutane at high concentration favours intermolecular coupling rather than ring closure; 1,2-dibromoethane gives ethene.
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