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The correct sequence of reagents for the preparation of \mathrm{Q \: and \: R} is :

Option: 1

\mathrm{(i)}\mathrm{CrO}_2 \mathrm{Cl}_2, \mathrm{H}_3 \mathrm{O}^{+}$; (ii) $\mathrm{Cr}_2 \mathrm{O}_3, 770 \mathrm{~K}, 20 \mathrm{~atm}$; (iii) $\mathrm{NaOH}$; (iv) $\mathrm{H}_3 \mathrm{O}^{+}


 


Option: 2

(i) \mathrm{KMnO}_4, \mathrm{OH}^{-}$; (ii) $\mathrm{Mo}_2 \mathrm{O}_3, \Delta$; (iii) $\mathrm{NaOH}$; (iv) $\mathrm{H}_3 \mathrm{O}^{+}


Option: 3

(i) \mathrm{Cr}_2 \mathrm{O}_3, 770 \mathrm{~K}, 20 \mathrm{~atm}$; (ii) $\mathrm{CrO}_2 \mathrm{Cl}_2, \mathrm{H}_3 \mathrm{O}^{+}$; (iii) $\mathrm{NaOH}$; (iv) $\mathrm{H}_3 \mathrm{O}^{+}


Option: 4

(i) \mathrm{Mo}_2 \mathrm{O}_3, \Delta$; (ii) $\mathrm{CrO}_2 \mathrm{Cl}_2, \mathrm{H}_3 \mathrm{O}^{+}$; (iii) $\mathrm{NaOH}$; (iv) $\mathrm{H}_3 \mathrm{O}^{+}


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