MCQ
Which of the following match is INCORRECT :
- A$Hg_2I_2 →$ Green
- B$Ag_2CrO_4→ $ Brick red
- ✓$BiI_3 → $ Orange
- D$BaCrO_4 → $ Yellow
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The total number of methyl $\left(- CH _3\right)$ group($s$) in compound $S$ is. . . .

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