MCQ
Triple degenerate $d-$ orbitals are exactly half-filled in
- A$Co^{3+}$ (octahedral field , low spin)
- ✓$Co^{2+}$ (tetrahedral field)
- C$Co^{3+}$ (Octahedral field, high spin)
- D$Co^{2+}$ (square planar field)

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$C{H_3}CN\xrightarrow{{Na + {C_2}{H_5}OH}}X\xrightarrow{{HN{O_2}}}Y\mathop {\xrightarrow{{{K_2}C{r_2}{O_7}}}}\limits_{{H_2}S{O_4}} Z$

Statement $I$ : Boron is extremely hard indicating its high lattice energy
Statement $II$ : Boron has highest melting and boiling point compared to its other group members.
In the light of the above statements, choose the most appropriate answer from the options given below