MCQ
The following reaction is


- ✓Nucleophilic substitution
- BElectrophilic substitution
- CFree radical substitution
- DNone of these

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(Given : atomic number $Sm =62 ; Eu =63 ; Tb =65 ; Gd =64, Pm =61 \text { ) }$
$A.$ $Sm$ $B.$ $Eu$ $C.$ $Tb$ $D.$ $Gd$ $E.$ $Pm$
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