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Q.

Which of the following is a Lewis acid?

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a

${CCl}_{4}$

b

${BF}_{3}$

c

$H_{2} O$

d

$S {O_{4}}^{2 -}$

answer is B.

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Detailed Solution

A species known as Lewis Acid will have unoccupied orbitals and will receive an electron pair, making it an electrophile. In the given options, ${BF}_{3}$ possesses an empty orbital that can receive an electron lone pair and is a potent electrophile. It is therefore a Lewis acid.

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