MCQ
Paramagnetic and coloured ions are :-
- A$Ce^{+4},\, Yb^{+2}$
- ✓$Gd^{+3},\, Nd^{+3}$
- C$La^{+3}, \,Lu^{+3}$
- D$Lr^{+3}, \,Lu^{+3}$
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The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is
$\underset{A}{\mathop{PhF}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underset{B}{\mathop{PhCl}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underset{C}{\mathop{PhBr}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underset{D}{\mathop{PhI}}\,$
