Choose the pairs of isoelectronic compounds which are isostructural:

1. TeF₂, XeF₂

2. IBr₂^-, XeF₂

3. IF₃, XeF₂

4. BeCl₂, XeF₂

AlF₃ is soluble in HF only in presence of KF. It is due to the formation of
(1) K₃[AIF₃H₃]

(2) K₃[AIF₆]

(3) AlH₃

(4) K[AIF₃H]

Which of the following is the incorrect statement?

1. PH₅  and BiCl₅  do not exist

2. pπ - dπ bonds are present in SO₂

3. SeF₄ and CH₄  have the same shape

4. \(I_{3}^{+}\) $\mathrm{has}$ $\mathrm{bent}$ $\mathrm{geometry}$