MCQ
$[Cu(CN)_4]^{2-}$ is more stable than $[Cu(NH_3)_4]^{2+}$ because :-
- Astability constant of $[Cu(CN)_4]^{2-}$ is greater than $[Cu(NH_3)_4]^{2+}$
- B$CN^-$ is stronger ligand than $NH_3$
- ✓both $(A)\, \& \,(B)$
- Dnone
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| Column $I$ | Column $II$ |
| $(A)$ $Image$ | $(p)$ Racemic mixture |
| $(B)$ $Image$ | $(q)$ Addition reaction |
| $(C)$ $Image$ | $(r)$ Substitution reaction |
| $(D)$ $Image$ | $(s)$ Coupling reaction |
| $(t)$ Carbocation intermediate |

Ratio of moles of formic acid obtained in reaction $(i)$ and reaction $(ii)$ is