# What would occur to an alkyl halide upon treatment with K^(+)""^(-)OBu^(t)?

An $\text{elimination reaction}$ would be the typical result.
RH_2C-CBrR' + K^(+)""^(-)OBu^trarrRHC=CHR' + KBr(s)darr + HOBu^t
In general, this use of a fairly bulky base gives the $\text{anti-Markownikow}$ olefin; i.e. the least substituted olefin. The precipitation of an inorganic salt provides a thermodynamic driving force to the reaction. For more details you will have to consult your organic chemistry text.