A Possible Lewis Structure for BF 3 Is Given Below

question 38

Multiple Choice

A possible Lewis structure for BF 3 is given below. Why does this resonance form contribute very little to the true electronic structure for this molecule?

• A) The formal charge of the Boron atom is +3 and the formal charge of each Flourine atom is - 1. This provides a charge separated compound.
• B) The formal charge of the Boron atom is - 1 and the formal charge of the top Flourine atom is +1. This places a negative charge on a metal and a positive charge on a highly electronegative non-metal atom.
• C) It does not obey the octet rule for Boron.
• D) It does not obey the octet rule for each Flourine.
• E) It does not use the proper number of valence electrons.

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