What happens when (i) n-butyl chloride is treated with alcoholic KOH, (ii) bromobenzene is treated with Mg in the presence of dry ether.
What happens when (i) n-butyl chloride is treated with alcoholic KOH, (ii) bromobenzene is treated with Mg in the presence of dry ether.

(i) The production of but-1-ene occurs when n-butyl chloride is treated with alcoholic KOH. A dehydrohalogenation process is what this is.

(ii) Phenylmagnesium bromide is generated when bromobenzene is reacted with Mg in the presence of dry ether.