. Which of the following is not a Lewis acid
(a) SiF4
(b) C2H4
(c) BF3
(d) FeCl3
Best Answer
Correct Option is (b) :
BF3 = electron deficient = Lewis acid
FeCl3 = electron deficient = Lewis acid
SiF4 = Si has empty d orbitals = Lewis acid
Hence the answer is option b
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