Answer:
Structural formula of ethanol is: \[C{{H}_{3}}C{{H}_{2}}OH\]
When ethanol is heated with excess of cone. \[{{H}_{2}}S{{O}_{4}}\] at 443 K it results in the dehydration of ethanol to give ethene.
\[\underset{Ethanol}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,\xrightarrow[443K]{Conc.{{H}_{2}}S{{O}_{4}}}\mathrm{ }\underset{Ethene}{\mathop{C{{H}_{2}}}}\,=C{{H}_{2}}+{{H}_{2}}O\]
Role of conc.\[{{H}_{2}}S{{O}_{4}}\]: Conc. \[{{H}_{2}}S{{O}_{4}}\] acts as a dehydrating agent which removes water from the ethanol.
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