when searching in the internet about why are alkenes more polar than alkanes (but still they are non-polar), they are always saying that the double bond is more polarizable , i understood the whole story about how the sp2 attract electrons from the sp3 and forming london forces, but they always said that vinylic bonds are slightly polar but i never understood why.
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Maybe because of resonance:
$H_{2}C=CH_{2}$ $\leftrightarrow$ $H_{2}C^{-}-C^{+}H_{2}$
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$\begingroup$ doesn't have to be bonded with an O or Cl or something with lone pairs for resonance to take place? $\endgroup$ – Abdelrahman Esmat May 29 '13 at 19:22
