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  4. Which of these is least likely to act as a Lewis base?

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Q. Which of these is least likely to act as a Lewis base?

NEETNEET 2013Equilibrium

Solution:

Electron rich species are called Lewis base.
Among the given, $ BF_3 $ is an electron deficient species, so have a capacity of electron accepting instead of donating. That's why it is least likely to act as a Lewis base. It is a Lewis acid.