- A

- B

- C

- ✓






Conjugate base is more stable due to more resonance of negative charge.
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$\mathrm{Eu}, \mathrm{Cm}, \mathrm{Er}, \mathrm{Tb}, \mathrm{Yb}$ and $\mathrm{Lu}$
$1$ litre of mixture $X +$ excess of $AgNO_3 \to Y$
$1$ litre of mixture $X +$ excess of $Ba Cl_2 \to Z$
Number of moles of $Y$ and $Z$ respectively are
$Cu^+ /Cu = + 0.52\, V$,
$Fe^{3+} /Fe^{2+} = +0.7 7\, V$,
$\frac{1}{2}{I_2}\left( s \right)/{I^ - }\, = + 0.54\,V,$
$Ag^+ /Ag = + 0.88\,V$.
Based on the above potentials, strongest oxidizing agent will be
$(I)$ gauche conformation of $1, 2$ -dibromoethane
$(II)$ anti conformation of $1, 2$ -dibromoethane
$(III)$ trans- $1, 4$ -dibromocyclohexane
$(IV)$ cis- $1, 4$ -dibromocyclohexane
$(V)$ tetrabromomethane
$(VI)$ $1, 1$ -dibromocyclohexane