
- ✓$(i) > (ii) > (iii)$
- B$(ii) > (i) > (iii)$
- C$(i) > (iii) > (ii)$
- D$(ii) > (iii) > (i)$

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$\mathrm{Cr}_2 \mathrm{O}_7^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{-} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_2 \mathrm{O}$
$\mathrm{X}, \mathrm{Y}, \mathrm{Z}$ and $\mathrm{A}$ are respectively are:
$(I)$ 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

$H_2O(l) \rightarrow H^+(aq) + OH^-(aq)\,;\,\,\Delta H = 57.32\,kJ$
$H_2(g)+ \frac{1}{2} O_2(g) \rightarrow H_2O(l)\,;\,\, \Delta H=-286.20\,kJ$
The value of enthalpy of formation of $OH^-$ ion at $25\,^oC$ is : .............. $\mathrm{kJ}$