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Subject - Chemistry:

Basics

MCQ - 461-2647

Question:

Which one is not a nucleophile

  1. H2O
  2. H2S
  3. BF3
  4. H2S

Correct Answer: C

Explanation:

BF3 is an electrophile.
Boron has an empty 2p orbital and there exists a strong partial positive charge on the boron due to the extremely electronegative fluorine atoms covalently bound to boron. This strong partial positive character, coupled with a vacant orbital, makes BF3 a potent Lewis acid and thus an electrophile.

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