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

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Reason : $V_2O_5$ or $Pt$ is used in the preparation of $H_2SO_4$ by contact process.
| Column $I$ | Column $II$ |
| $(1)$ Actinoid having configuration $(RN)5f^76d^17s^2 $ | $(A) \ Ce$ |
| $(2)$ Lanthanoid which has $4f^{14}$ electronic confi guration in $+3$ oxidation state. | $(B) \ Lu$ |
| $(3)$ Lanthanoid which show $+4$ Oxidation state | $(C) \ Cm$ |