Among alkyl halide (or) alcohol during elimination which is more reactive

According to Saytzeff rule, any alkyl halide or alcohol that gives a more highly substituted (more stable) alkene undergoes dehydrohalogenation faster than the one which gives a less highly substituted (less stable) alkane. Thus, the case of dehydrohalogenation of different alkyl halides or alcohols having the same halogen/OH group decreases in the order: 3^∘(tertiary)>2^∘(secondary)>1^∘(Primary)