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What is a dehydration reaction ? Explain...

What is a dehydration reaction ? Explain this reaction with the help of an example.

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Removal of water molecules from a compound is known as dehydration reaction.
Example : When Ethanol is heated at 443 K with excess conc. `H_2SO_4`, the water molecules get removed from it and ethene is obtained.
`CH_3CH_2OH overset("Hot conc. "H_2SO_4)underset(443K)to CH_2 = CH_2 + H_2O`
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