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a.

Sorry if you picked a. The chlorine is one atom away from fluorine. The boron is four atoms away from fluorine. The fact that chlorine is less elecronegatie than fluorine makes the B-Cl bond less polar than the B-F bond. and boron are both Cl and B

b.

Great if you picked b. The fluorine and boron have the biggest difference in EN so they would have the most polar bond.

c.

Sorry if you picked c.

Carbon and iodine are two and three atoms away from fluorine. They have similar electronegativity,EN, values. Actually carbon has EN = 2.5 and Iodine has EN = 2.5. the values are identical.

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periodic table electronegativity

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