# Which of these is least likely to act as a Lewis base ? Option 1) PF3 Option 2) CO Option 3) F- Option 4) BF3

$BF_3$ has no lone pair of electrons to donate and cannot therefore act as a lewis base

Option 1)

PF3

Incorrect

Option 2)

CO

Incorrect

Option 3)

F-

Incorrect

Option 4)

BF3

Correct

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