In unsaturated hydrocarbons electrons favour___________________?
Correct answer: B. addition reactions
- A. less reactivity
- B. addition reactions
- C. substitution reactions
- D. none
Explanation
The pi bond in an unsaturated hydrocarbon is relatively exposed and can break while new sigma bonds form, so unsaturated hydrocarbons commonly undergo addition reactions. A student may choose substitution because alkanes characteristically undergo substitution, but that reaction pattern belongs mainly to saturated hydrocarbons.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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