Question

# $${ BF }_{ 3 }$$ and $${ NH }_ { 3 }$$ undergo a Lewis acid-base reaction forming an adduct. Which picture below currently represents the curved arrow notation for the initial Lewis acid-Lewis base interaction in this reaction, what is the Lewis acid and the Lewis base?

A
Picture (1) is correct; NH3 is the Lewis acid and BF3 is the Lewis base.
B
Picture (2) is correct; BF3 is the Lewis acid and NH3 is the Lewis base.
C
Picture (3) is correct; NH3 is the Lewis acid and BF3 is the Lewis base.
D
Picture (4) is correct; BF3 is the Lewis acid and NH3 is the Lewis base.

Solution

## The correct option is A Picture (2) is correct; $${ BF }_{ 3 }$$ is the Lewis acid and $${ NH }_{ 3 }$$ is the Lewis base.Since $$B$$ haas a vacant orbital $$NH_3$$ gives electron to Baron and undergoes a Lewis acid base reactions.So, $$BF$$ is a Lewis acid and $$NH_3$$ is a Lewis base.ChemistryNCERTStandard XII

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