In preparation of alkene from alcohol using $\mathrm{Al}_{2} \mathrm{O}_{3}$ which is effective factor?

In preparation of alkene from alcohol using $\mathrm{Al}_{2} \mathrm{O}_{3}$ which is effective factor?
  1. Porosity of $\mathrm{Al}_{2} \mathrm{O}_{3}$
  2. Temperature
  3. Concentration
  4. Surface area of $\mathrm{Al}_{2} \mathrm{O}_{3}$

Solution

Temperature is the effective factor for dehydration of alcohols by $\mathrm{Al}_2 \mathrm{O}_3$.
$\mathrm{R}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{OH} \underset{350^{\circ}-380^{\circ} \mathrm{C}}{\stackrel{\mathrm{Al}_2 \mathrm{O}_3}{\longrightarrow}}$ $\mathrm{R}-\mathrm{CH}=\mathrm{CH}_2+\mathrm{H}_2 \mathrm{O}$
At $220^{\circ}-250^{\circ}$ it forms ether.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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