NEET Chemistry NEET PYQ-Alcohols Phenols and Ethers

In preparation of alkene from alcohol using \[A{{I}_{2}}{{O}_{3}}\] which is effective factor? [AIPMT 2001]

A) Porosity of \[A{{l}_{2}}{{O}_{3}}\]

B) Temperature

C) Concentration

D) Surface area of \[A{{l}_{2}}{{O}_{3}}\]

Correct Answer: B

Solution :

[b] Temperature is the effective factor for dehydration of alcohol by \[A{{l}_{2}}{{O}_{3}}\]

\[R-C{{H}_{2}}-C{{H}_{2}}OH\underset{{{350}^{o}}-{{380}^{o}}C}{\mathop{\xrightarrow{A{{l}_{2}}{{O}_{3}}}}}\,\]\[R-CH=C{{H}_{2}}+{{H}_{2}}O\]

While at \[220{}^\circ -250{}^\circ C\] it forms ether.