why we don't make direct chloro alcohol ?
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UltraPure™ Phenol:Chloroform:Isoamyl Alcohol (25:24:1, v/v) is used in thepurification of nucleic acids. This reagent consists of highly pure chloroform, isoamyl alcohol, and UltraPure™ Phenol saturated with Tris-HCl.
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When alcohols react with a hydrogen halide, a substitution takes place producing an alkyl halide and water:

The order of reactivity of alcohols is 3° > 2° > 1° methyl.
The order of reactivity of the hydrogen halides is HI > HBr > HCl (HF is generally unreactive).
The reaction is acid catalyzed. Alcohols react with the strongly acidic hydrogen halides HCl, HBr, and HI, but they do not react with nonacidic NaCl, NaBr, or NaI. Primary and secondary alcohols can be converted to alkyl chlorides and bromides by allowing them to react with a mixture of a sodium halide and sulfuric acid:

Because Cl- is a weaker nucleophile than Br-, the reaction with HCl requires a catalyst such as ZnCl2 as shown below.

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