Metal ions in the fourth period are expected to show decrease in their ionic radii of the M ²⁺ ions from Ca ²⁺ to Zn ²⁺ , due to the increase in the nuclear charge, as shown by the dotted line in the Figure given below. When they form octahedral complexes with weak field ligands, the expected regular decrease is not observed, as shown by the solid line in the Figure. The correct statement(s) is/are

Options

1. AThe ionic radius of Cr ³⁺ is more than V ³⁺ in their respective weak field octahedral complexes.
2. BThe heat of hydration of [ Cr ( H ₂ O )₆ ]²⁺( aq ) is more than [ Ti ( H ₂ O )₆ ]²⁺( aq ) .
3. CThe anomalous trend in the radius of Cr ²⁺ as shown in the Figure is due to occupancy of electron in the e _g
4. DWhen metal ions shown in above Figure form complexes with strong field ligands like CN ⁻ , the anomalous trend