Which of the following cannot form alkenes?
Answer:
Methane cannot form an alkene because an alkene requires at least 2 carbon atoms. Methane contains only one carbon atom.
Ethane and Propane have 2 and 3 carbon atoms respectively. They are capable of forming alkenes.
Not exactly sure about the question - if you're asking whether these things can be turned into alkenes, or if you can use them to build alkenes. If you're asking whether these things can be turned into alkenes, methane cannot, but ethane and propane can. This would be very difficult, however, as these molecules don't have any traditional reactive groups. You'd have to use some combination of high heat and harsh reaction conditions. If you're asking which of them can be used to make alkenes, theoretically you could combine all of them to form alkenes in some way. But again, these molecules are very, very unreactive (nothing but very stable carbon and hydrogen), so you'd have to use very harsh reaction conditions.
Good luck!
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