With tertiary alcohols, the reaction is conducted by simply shaking the
alcohol with concentrated HCl at room temperature Constant boiling
with HBr (48%) is used for preparing alkyl bromide Good yields of
R—I may be obtained by heating alcohols with sodium or potassium
iodide in 95% orthophosphoric acid The order of reactivity of alcohols
with a given haloacid is 3°>2°>1°