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What is the catalyst in the reaction of a primary alcohol with HCl to obtain a chloroalkane?

(a) anhydrous ZnCl2

(b) concentrated H2SO4

(c) red phosphorous

(d) pyridine

The question was asked in an interview for job.

My query is from Methods of Preparation of Haloalkanes in chapter Haloalkanes and Haloarenes of Chemistry – Class 12

1 Answer

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Correct choice is (a) anhydrous ZnCl2

The best explanation: The presence of anhydrous ZnCl2 is to be break the C-O bond in alcohols. ZnCl2 is a Lewis acid and reacts with the oxygen of the alcohol group.

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