Answer:
In the presence of water, KOH dissociates completely into ions.
These are strong nucleophiles and produce alcohols from alkyl halides.
Hydration of ions
also takes place. So they are not able toabstract from -atom.
So alkenes are not formed. In alcoholicmedium, solution also contains ,
ethoxide ions in addition to ions.
Being a stronger base, they abstract ion
from. -C-atom
givingrise to alkene. (Dehydrohalogenation).
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