MCQ
Identify correct reactivity order for ${{S}_{{{N}^{2}}}}$ reaction


- A$i > ii > iii$
- B$ii > iii > i$
- C$i > iii > ii$
- ✓$iii > ii > i$

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If $(n=4)$ then di-carboxylic acid. would be known as

(Excess)
$N H_{3}+3 C l_{2} \rightarrow Y$
(Excess)
What is $X$ and $Y$ in the above reaction?