Which of the following

Question:

Which of the following has the square planar structure :-

1. $\mathrm{NH}_{4}^{+}$

2. $\mathrm{CCl}_{4}$

3. $\mathrm{XeF}_{4}$

4. $\mathrm{BF}_{4}^{-}$

Correct Option: , 3

Solution: