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CH3-CH2-CHOH + SOCl2 -----> CH3CH2CHCl+SO2+HCl
thionyl chloride in this reaction replaces hydrxy group with chlorine to form alkyl halide...and the byproduct obtained can easily be separated as both of them are gases
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When 1- propanol is treated with SOCl2, following reaction takes place
CH3-CH3-CHOH + SOCl2 -----> CH3CH2CHCl+SO2+HCl