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MCAT Question A Day - 4/26/13 - Answer!

Alkenes differ from alkanes in that

A.  they are more reactive.
B.  they can have geometrical isomers and alkanes cannot.
C.  they undergo halogenation and alkanes do not.
D.  None of the above

The correct answer is (A). Alkenes contain one or more pi bonds, which makes them more reactive than saturated compounds. They typically undergo electrophilic addition reactions because of the electron-rich pi bond.