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How to prepare ethene from alcohol?...

How to prepare ethene from alcohol?

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When ethanol are heated with concentrated sulphuric acid, they undergo dehydration to give alkenes.
`underset("ethanol ethyl alcohol")(CH_(3) - CH_(2) ) - OH underset(170^(@) C )overset("Conc"-H_(2)SO_(4)) (rarr) underset("ethene")(CH_(2) = CH_(2)) + H_(2)O`
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