What are the enthalpies of $\sigma$-bond and $\pi$-bonds in an alkene?
- A$397 \ kJ \ mol^{-1}$ and $284 \ kJ \ mol^{-1}$
- B$284 \ kJ \ mol^{-1}$ and $397 \ kJ \ mol^{-1}$
- C$450 \ kJ \ mol^{-1}$ and $300 \ kJ \ mol^{-1}$
- D$300 \ kJ \ mol^{-1}$ and $450 \ kJ \ mol^{-1}$
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