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(a) Explain the mechanism involved in th...

(a) Explain the mechanism involved in the conversion of ethanol into ethene.
(b) An organic compound with molecular formula `C_(6)H_(6)O` gives white precipitatewith bromine water. Identify the functional group in the organic compound and write the chemical equation for the reaction.

Text Solution

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(a) (1) Formation of protonated alcohol `CH_(3)-CH_(2) -OH +overset(+)(H)overset(“fast”)hArr  CH_(3) -CH_(2) -overset(+)OH_(2)`
Formation of carbocation 
`CH_(3) -CH_(2) -overset(+)OH_(2) overset(“slow”) hArrCH_(3) -overset(+)CH_(2) +H_(2) O` 
(3) Elimination of proton to form ethene
`CH_(3) -overset(+)(CH_(2))hArr CH_(2) =CH_(2) + H^(+)` (b) The organic compound is phenol
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