MCQ
Which element is estimated by Carius method
- ACarbon
- BHydrogen
- ✓Halogen
- DNitrogen
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$MnO_2+ 4HCl \to MnCl_2 + 2H_2O + Cl_2$
If molar mass of hydrochloric acid is $M$.

$(A)$ $(\gamma, n)$ $(B)$ $(p, D)$ $(C)$ $(n, D)$ $(D)$ $(\gamma, p)$
$\begin{array}{*{20}{c}}{ - OAc}\\{\rm{I}}\end{array}$$\begin{array}{*{20}{c}}{ - OMe}\\{{\rm{II}}}\end{array}$$\begin{array}{*{20}{c}}{ - OS{O_2}Me}\\{{\rm{III}}}\end{array}$$\begin{array}{*{20}{c}}{ - OS{O_2}C{F_3}}\\{{\rm{IV}}}\end{array}$
The order of leaving group ability is