MCQ
Methanides are
- A$Mg_2\,C_3,Be_2\,C, Al_4\,C_3$ and $CaC_2$
- B$Mg_2\,C_3, Be_2\,C$ and $Al_4\,C_3$
- C$Be_2\,C, Al_4\,C_3$ and $CaC_2$
- ✓$Be_2\,C$ and $Al_4\,C_3$
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Electron geometry $-$ Possible molecular shape from respective electron geometry
| $I.P.$ | Reason |
| $(A)$ $N > O$ | Half filled configuration |
| $(B)$ $Zr < Hf$ | Lanthenide contraction |
| $(C)$ $Na > K$ | $Z_{eff}$ |
| $(D)$ $Al < Ga$ | Transition contraction |