The correct sequence of reagents for the preparation of Q and R is:

1. (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) ${\mathrm{H}}_3{\mathrm{O}}^{+}$
2. (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) ${\mathrm{H}}_3{\mathrm{O}}^{+}$
3. (i) ${\mathrm{KMnO}}_4, {\mathrm{OH}}^{-}$; (ii) ${\mathrm{Mo}}_2{\mathrm{O}}_3, \mathrm{\Delta }$; (iii) $\mathrm{NaOH}$; (iv) ${\mathrm{H}}_3{\mathrm{O}}^{+}$
4. (i) ${\mathrm{Mo}}_2{\mathrm{O}}_3, \mathrm{\Delta }$; (ii) ${\mathrm{CrO}}_2{\mathrm{Cl}}_2, {\mathrm{H}}_3{\mathrm{O}}^{+}$; (iii) $\mathrm{NaOH}$; (iv) ${\mathrm{H}}_3{\mathrm{O}}^{+}$

Solution

Asked in: JEE Main 2023 (25 Jan Shift 1)

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