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There isn't a cut off in polar and non-polar molecules as a polar molecule. But, for covalent bonds the difference in electronegativity is less than 1.5 and for ionic bonds the difference in electronegative is greater than 2.
You can consider that bond is polar if there are a difference in electronegativity. If the electronegativity is different, it means that there are difference in how much the nucleus will pull the shared electron towards it.
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