Why and what is role of organic peroxide in preparing haloalkane from sulphuryl chloride and alkanes

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Q. (a) Why is high temperature avoided in the preparation of hydrogen chloride from sodium sulphate and concentrated sulphuric acid?
(b) Sodium chloride is preferred for the preparation of HCI. Why? [2 MARKS]

In the preparation of hydrogen chloride from sodium chloride and sulphuric acid, the sulphuric acid used should be concentrated

To prepare hydrogen chloride from sodium chloride and concentrated sulphuric acid.

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

(a) Write the equation for:
(i) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(ii) the preparation of ammonia from ammonium chloride and calcium hydroxide.
(iii) the reaction of hydrogen chloride with ammonia.

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