Which pair of ions among the following list do not constitute an iso-electronic pair?

1. Mn²⁺, Fe³⁺

2. Fe²⁺, Mn²⁺

3. O^2–, F^–

4. Na⁺, Mg²⁺

Identify the incorrect statement among the following:

Among the following, iso-electronic species are:

1. CO₂, NO₂

2. $N{O}_2^{-}$, CO₂

3. CN^–, CO

4. SO₂, CO₂

Which of the following two species in the pair are isostructural:

1.  $Xe{F}_2$ $,$ $I{F}_2^{-}$

2. $N{H}_3$ $,$ $B{F}_3$

3. $$ $C{O}_3^{-2}$ $,$ $S{O}_3^{-2}$

4. $PC{l}_5$ $,$ $IC{I}_5$

Among the following, the compound that is electron deficient is:

1. BaCl₂

2. BCl₃

3. CCl₄

4. PCl₅

Among the options given below, identify the Isoelectronic species:

1. CO, CN^–, NO⁺, C₂^2–

2. CO^–, CN, NO, C₂^–

3. CO⁺, CN⁺, NO^–, C₂

4. CO, CN, NO, C₂

In $P{O}_4^{-3}$, formal charge on every oxygen atom and P-O bond order respectively are:
1. –0.75 and 1.25
2. –0.5 and 2
3. 1 and 1.5
4. –0.75 and 2