NEET 2023 — Chemistry solution

NEET2023Chemistry

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

A
$H_{2} O$
B
$BF_{3}$
C
$OH^{-}$
D
$NH_{3}$

Solution

A Lewis acid is an electron-pair acceptor — it must have an empty orbital. Boron in $BF_{3}$ has only six electrons around it and a vacant $2 p$ orbital, so it readily accepts a pair of electrons.

$H_{2} O$ , $OH^{-}$ , and $NH_{3}$ all carry lone pairs and act as Lewis bases instead.

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