Question

3. Which of the following can act as a Lewis base?
A) BF3
B) PF3
C) CH4
D) SIF4​

Answer 1

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→ Which of the following can act as a Lewis base?

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→ Option [A]

→ BF3

$\huge{\tt {\underline{Explanation :}}}$

→ A species which has a lone pair of electrons and donates it in the acid-base reaction is known as Lewis base. From the given options, NH2−NH2 has a lone pair acceptor species or a Lewis acid. NH4+ is electron deficient. BF3, on the other hand, is a Lewis acid.

Answer 2

Answer: Option B) PF3

Explanation: Others are either Lewis bases or have a complete octet.