Neet Solved Paper 2013 Question 26

Question: Which of these is least likely to act as a Lewis base?

Options:

A) CO

B) $ {F^{-}} $

C) $ B{F_3} $

D) $ P{F_3} $

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Answer:

Correct Answer: C

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

thats why it is least likely to act as a Lewis base. It is a Lewis acid.