Preparation of Alkyl halides

Why halogenation of Alkane is not suitable method for preparation of Alkyl halide ?

In the preparation of alkyl halide from alcohol which of the following reagent is preferred?

In the preparation of alkyl halide from alcohol which of the following reagents preferred?

In the preparation of alkyl halide from alkene and halogen which of the following reaction is involved

In the preparation of alkyl halide from alkene and halogen which of the following reaction is involved

Which of the reagent is used in the Grove's process for the preparation of alkyl halide fropm secondary alcohols ?

Preparation OF Alkyl Halide by EAR Addition OF HX (hydrohalogenation OF Alkenes and Alkynes)