Ethene is prepared from alcohol by _ ?
Correct answer: B. Dehydration
- A. Decomposition
- B. Dehydration
- C. Dehydroxylation
- D. Dehalogenation
Explanation
Ethene is prepared from alcohol by dehydration. Dehydration is the removal of water from a compound. In the case of ethene, the water is removed from an alcohol molecule to form an alkene molecule. The dehydration of alcohol can be carried out using a variety of dehydrating agents, such as concentrated sulfuric acid, phosphoric acid, or alumina. The reaction is usually carried out at high temperatures, typically between 170 and 200 degrees Celsius. The following is the chemical equation for the dehydration of ethanol to form ethene: CH3CH2OH → CH2=CH2+ H2O where ethanol is the alcohol, ethene is the alkene, and H2O is water.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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