Which of the following reactions does not take place? BF 3+ F - longrightarrow BF 4- .....(I) BF 3+3 F - longrightarrow BF 63-......(II) AlF 3+3 F - longrightarrow AlF 63-.....(III)

Question

Which of the following reactions does not take place? BF 3+ F - longrightarrow BF 4- .....(I) BF 3+3 F - longrightarrow BF 63-......(II) AlF 3+3 F - longrightarrow AlF 63-.....(III) (A) Only (I) (B) Only (II) (C) Only (III) (D) Only (I) and (III)

Tardigrade Admin · Accepted Answer

BF 3 forms complex halides of the type [ BF 4-]in which B atom has C.N. 4, it cannot extend its C.N. beyond 4 due to the nonavailability of d-orbitals in its configuration. Hence, BF 3 6 ion ( sp 3 d 2 hybridisation) is not formed. On the other hand, Al can extend its C.N. beyond 4 due to the availability of d-orbitals in its configuration.

Q. Which of the following reactions does not take place? BF3​+F−⟶BF4−​.....(I) BF3​+3F−⟶BF63−​......(II) AlF3​+3F−⟶AlF63−​.....(III)

Only (I)

Only (II)

Only (III)

Only (I) and (III)

Q. Which of the following reactions does not take place?
$B F_{3} + F^{-} ⟶ B F_{4}^{-} .....$ (I)
$B F_{3} + 3 F^{-} ⟶ B F_{6}^{3 -} ......$ (II)
$A l F_{3} + 3 F^{-} ⟶ A l F_{6}^{3 -} .....$ (III)