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Two reasons: On the grand scale of things, the polarity of a $\ce{C-H}$ bond is very low. The electronegativity difference is less than $0.5$ which is generally the cutoff of a mostly unpolar bond. Typically when looking at an alkene at large, the various (small) polarities of the different $\ce{C-H}$ bonds cancel each other out or come very close to doing ...


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A compound or a molecule being polar or non-polar is rather a fuzzy term. Being non-polar does not mean no polarity of chemical bonds. It means this polarity is low enough for atoms of such a molecule not to interact with other molecules by relatively strong inter-molecular interactions. These include strong dipole-dipole interactions, hydrogen bonds or ...


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