Q47 / 200 · Manipal (MET) 2010 · Chemistry

Which is Lewis acid?

  • Correct answer
    A
    $\mathrm{BF}_3$
  • B
    $\mathrm{NF}_3$
  • C
    $\mathrm{Cl}^{-}$
  • D
    $\mathrm{H}_2 \mathrm{O}$

Solution

Electron acceptors are Lewis acids. They are electron deficient compounds. $\mathrm{BF}_3$ is Lewis acid because B has only 6 electrons in its valence shell and it can accept electrons. $\mathrm{NF}_3, \mathrm{Cl}^{-}$and $\mathrm{H}_2 \mathrm{O}$ have lone pair of electrons. Thus, they are electron donors and Lewis bases.

Hence, the correct answer is option: 'A'.

Relevant Questions