MCQ
What is $X$ in the following reaction?


- ✓$CH _{3} OH , H _{2} SO _{4}$
- B$CH _{3} OH , CH _{3} O ^{-} Na^+$
- C$H _{2} O _{/} H _{2} SO _{4}$ followed by $CH _{3} OH$
- D$CH _{3} MgBr _{\text {/ether }}$ followed by $H _{3} O ^{+}$


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$[A]$ $\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{BeO}, \mathrm{SnO}, \mathrm{SnO}_2$
$[B]$ $\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{CrO}, \mathrm{SnO}, \mathrm{PbO}$
$[C]$ $\mathrm{NO}, \mathrm{B}_2 \mathrm{O}_3, \mathrm{PbO}, \mathrm{SnO}_2$
$[D]$ $\mathrm{ZnO}, \mathrm{Al}_2 \mathrm{O}_3, \mathrm{PbO}, \mathrm{PbO}_2$
