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Question
- What is the special feature of the structure of:
- C2H2?
- C2H4?
- What type of reaction is common to both of these compounds?
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Solution
-
- C2H2 contains a triple bond between the two carbon atoms (one sigma and two pi bonds) and has a linear molecular geometry (180° bond angle).
- C2H4 contains a double bond between the two carbon atoms (one sigma and one pi bond) and has a coplanar, trigonal planar geometry (≈ 120° bond angle).
- Both compounds commonly undergo addition reactions (such as hydrogenation or halogenation) because they are unsaturated hydrocarbons containing multiple carbon-carbon bonds that can easily open up to bond with new atoms.
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