The thionyl chloride method is preferred over hydrogen chloride or phosphorous chloride method for the preparation of haloalkanes because both the by-products SO2 and HCl in this case are gases and escape leaving behind pure chloroalkane- This reaction takes place in the presence of

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Preparation of Haloalkanes from Alcohol

The thionyl c...

Question

The thionyl chloride method is preferred over hydrogen chloride or phosphorous chloride method for the preparation of haloalkanes because both the by-products (SO₂ and HCl) in this case are gases and escape leaving behind pure chloroalkane. This reaction takes place in the presence of

Conc. sulphuric acid

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Phosphoric acid

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Anhydrous zinc chloride

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Pyridine

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Solution

The correct option is D
Pyridine

Pyridine molecule act as a catalyst which is used to neutralise HCl formed.Pyridine also acts as a nucleophile because in the reaction proton is added to alcoholic O due to strong electronegative

SOCl₂ group and proton is removed by pyridine and reforms S=O and Cl^- is removed from SOCl_2.This Cl^- ion reacts with electrophilic C atom of alcohol and displaces SO₂ and another releases another Cl^-
Ion which makes alkyl chloride.

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The thionyl chloride method is preferred over hydrogen chloride or phosphorous chloride method for the preparation of haloalkanes because both the by-products (SO₂ and HCl) in this case are gases and escape leaving behind pure chloroalkane. This reaction takes place in the presence of

Q. Hydrogen chloride and

S O_{2}

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Q. Assertion: Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.

Reason: Phosphorus chlorides give pure alkyl halides.
[1 Mark]

Q. Thionyl chloride

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Thionyl chloride is preferred in the preparation of chlorine compounds from alcohols because:

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The thionyl chloride method is preferred over hydrogen chloride or phosphorous chloride method for the preparation of haloalkanes because both the by-products (SO2 and HCl) in this case are gases and escape leaving behind pure chloroalkane. This reaction takes place in the presence of

The thionyl chloride method is preferred over hydrogen chloride or phosphorous chloride method for the preparation of haloalkanes because both the by-products (SO₂ and HCl) in this case are gases and escape leaving behind pure chloroalkane. This reaction takes place in the presence of