MCQ
Which is the correct reactivity order for $E_2$ reaction with alcoholic $KOH$ ?


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

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Information:
$HCHO\xrightarrow[{dil{H_2}S{O_4}}]{{NaCN}}A\xrightarrow[{\operatorname{P} t}]{{{H_2}}}B$ The product $(B)$ is
| List$-I$ Name of oxo acid | List$-II$ Oxidation state of $P$ |
| $(a)$ Hypo phosphorous acid | $(i) +5$ |
| $(b)$ Orthophosphoric acid | $(ii)+4$ |
| $(c)$ Hypo phosphoric acid | $(iii) +3$ |
| $(d)$ Orth phosphorous acid | $(iv)+2$ |
| $(v)+1$ |
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