ALCOHOL -------> ALKENE
- In the dehydration of alcohols, a molecule of water is eliminated from each alcohol molecule to produce alkene.
- There are two methods of dehydration:
a) Ethanol vapour is passed over a heated unglazed porcelain chips, porous pot, pumice stone or alumina (aluminium oxide).
b) Ethanol is heated under reflux at 170 °C with excess concentrated sulphuric acid.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKC4pZdqjpxO1XTKLWJUhyphenhyphenN95yI5n1j2RWX7gsqsTwYsXrxiwgWBmjdDBAbZoCSCo44EjovG-Jq8OZkJd4GqiiXvy_FI7NRWBAOUzU4Gf1y2j2c4s5tTq2AkdV4s9wy1R8o9QM05v-gqw/s1600/reaction_fig08.gif)
School Laboratory Experiment
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWJ_FjqQ_sDqAPMyNsTjM0mmbI7XMG8Ii1Fakt3CJTZqCgpee-3ZDlv0apQhyphenhyphenda1cazFiUnJr7dLFYYrNETtgv7Gtg2tifoHOu0G_Bq8odXkEoj5vctL8V-KUtIbKkskmufovR-4pqoZ8/s1600/dehydration-of-ethanol-to-form-ethene2-267.jpg)
- Alkene can be tested by decolourising brown bromine water or decolourising purple acidified potassium manganate (VII) solution.
1 comment:
This "dehydration" issue, interesting to me..
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