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The more strongly an atom attracts the electrons in its bonds, the larger its electronegativity. Electrons in a polar covalent bond are shifted toward the more electronegative atom which is the one with the partial negative charge and results in a positive charge in the other atoms which is stronger than a non polar which is fairly equal in electronegativity.
The reason polar bonds are stronger is because the more electronegative atom attracts electrons of the other atom, shortening and strengthening the bond. As for coordinate covalent bonds, I think they are just as strong as any other covalent bond, but if someone else could confirm this that would be great.
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