The general formula for alkenes is:______________?
Correct answer: C. CnH2n
- A. CnH2n+1
- B. CnH2n+2
- C. CnH2n
- D. CnH2n-2
Explanation
An open-chain alkene with one carbon-carbon double bond has the general formula CnH2n, because the double bond removes two hydrogen atoms compared with an alkane, CnH2n+2. Students may choose CnH2n+2 by recalling the alkane formula instead of the alkene formula.
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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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