MCQ
Which of the following metals make the most efficient catalyst
- ✓Transition
- BAlkali
- CAlkaline earth
- DColoured metals
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The correct order of ${S_{{N^1}}}$ reactivity is

Figure $\xrightarrow[{(ii)\,\,NaB{D_4}}]{{(i)\,\,Hg{{(OAc)}_2}\,{H_2}O}}Q$
Figure $\xrightarrow[{(ii)\,\,{H_2}{O_2}\,/\,O{H^ - }}]{{(i)\,\,B{D_6}\,,\,THF}}R$
Products $P, Q$ and $R$ are
Reason : $SO_2$ is a reducing agent