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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$C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\xrightarrow{NaCN}$ $X\xrightarrow[heat]{{{H}_{3}}{{O}^{+}}}Y\xrightarrow[{{H}^{+}}]{C{{H}_{3}}C{{H}_{2}}OH}Z$
Which of the above statements are correct?
$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$

