SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The B-F bond in BF3 (electronegativity for B is 2.0; electronegativity for F is 4.0) is
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polar covalent
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ionic
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nonpolar covalent
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pure covalent
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Explanation:
Detailed explanation-1: -The B–F bond length in BF3 is shorter than the B–F bond length in BF4 − . BF3 is an electrondeficient species. With a vacant p-orbital on boron the fluorine and boron atoms undergo p–p back-bonding to remove this deficiency. This imparts a double bond character to the B–F bond.
Detailed explanation-2: -The double bond character changes to single bond and the B−F bond length becomes 143 pm.
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