MCQ
Which of the following is most active halogen
- A$C{l_2}$
- B$B{r_2}$
- C${I_2}$
- ✓${F_2}$
$I _2\,<\, Br _2\,<\, Cl _2\,<\, F _2$
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[where $Et$ is $- C _{2} H _{5}$ ]
Compound $'A'$


$(i)\, KCl$ or $MgO$ $(ii) \,LiF$ or $LiBr$ $(iii)\, Mg_3N_2$ or $NaCl$