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Equilibrium
Question
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Which of these is least likely to act as a lewis base? 

  • CO

  • F-

  • BF3

  • PF3

Answer

C.

BF3

Electron rich species are called lewis base. Among the given, BF3 is an electron deficient species, so have a capacity of electrons accepting instead of donating that's why it is least likely to act as a lewis base. It is a lewis acid. 

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