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Alkenes are more reactive than alkanes because their C=C double bond can react in a way where the pi bond breaks and is replaced by two new sigma bonds. What is this type of reaction called?
AA substitution reaction
BAn elimination reaction
CA disproportionation reaction
DAn addition reaction
Answer & Solution
Correct answer: D. An addition reaction
1. The reactive part of an alkene is its pi bond, which is weaker than a sigma bond and breaks more readily.
2. The text explains: "in which the π bond is broken and replaced by two σ bonds. This reaction is called an addition reaction."
3. In an addition reaction, new atoms or groups are added across the former double bond -- nothing is substituted out or eliminated.
4. So this characteristic alkene reaction is called an addition reaction.
_Source: OpenStax Chemistry Ch 20 "Organic Chemistry", p.1105 §20.1 Hydrocarbons_
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