MCQ
Ethylene di bromide on heating with metallic sodium in ether solution yields
- AEthene
- BEthyne
- ✓$2-$ butene
- D$1-$ butene

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$(1)$ Ligands are connected to the central metal ions by covalent bonds.
$(2)$ Secondary valencies have directional properties
$(3)$ Secondary valencies are non-ionisable Of these statements