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

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is an example of which of the following types of reactions
$(i)$ $\left[ FeF _{6}\right]^{3-}$
$(ii)$ $\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}$
$(iii)$ $\left[ NiCl _{4}\right]^{2-}$
$(iv)$ $\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$
