First slide

Lewis theory

Question

Which of the following fluoro compounds is most likely to behave as a Lewis base?

Easy

A

${BF}_{3}$
B

$P F_{3}$
C

$C F_{4}$
D

$S i F_{4}$

Solution

${BF}_{3} ⟶ Lewis acid (incomplete octet)$
${PF}_{3} ⟶ Lewis base (presence of lone pair on P -atom)$
${CF}_{4} ⟶ Complete octet$ , $non availability of vacant d orbitals \to Neither Lewis acid nor Lewis base$
${SiF}_{4} ⟶ Lewis acid (empty d -orbital in Si-atom)$

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