The correct shape and hybridization for XeF₄ are:

1. Octahedral, sp³d²

2. Trigonal bipyramidal, sp³d³

3. Planar triangle, sp³d³

4. Square planar, sp³d²

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

Mark the correct order of repulsion among the following according to the VSEPR theory.

In which orbital is the pair of electrons located in the provided carbanion, CH₃C≡C^– ?

1. sp³
2. sp²
3. sp
4. 2p

The decreasing order of stability of ${\mathrm{O}}_2,{\mathrm{O}}_2^{-},{\mathrm{O}}_2^{+}$ $\mathrm{and}$ ${\mathrm{O}}_2^{2-}$is: 

1. ${\mathrm{O}}_2^{+}>{\mathrm{O}}_2>{\mathrm{O}}_2^{-}>{\mathrm{O}}_2^{2-}$

2. ${\mathrm{O}}_2^{2-}>{\mathrm{O}}_2^{-}>{\mathrm{O}}_2>{\mathrm{O}}_2^{+}$

3. ${\mathrm{O}}_2>{\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{2-}>{\mathrm{O}}_2^{-}$

4. ${\mathrm{O}}_2^{-}>{\mathrm{O}}_2^{2-}>{\mathrm{O}}_2^{+}>{\mathrm{O}}_2$

Which of the following species contains an equal number of $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds?

1. ${\mathrm{HCO}}_3^{-}$

2. ${\mathrm{XeO}}_4$

3. ${\left(\mathrm{CN}\right)}_2$

4. CH₂(CN)₂