MCQ
Correct option :


- A

- B

- ✓

- D$R$ to $S$ is carried out at $pH$ = $9.5$





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Reason : Zinc is a powerful reducing agent than copper.
$\begin{array}{l}
Mg(s) + 2A{g^ + } \to M{g^{ + 2}} + 2Ag(s)\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{(0}}{\rm{.0001M) (0}}{\rm{.100M)}}
\end{array}$
If $E_{cell}^o = 3.17\,V$

The order of decreasing reactivities of these alcohols towards nucleophilic substitution with $HBr$ is