(A) Anhydrous ZnCl₂ is used in reaction of alcohols with HCl.
(R) ZnCl₂ forms a complex with oxygen of alcohol and converts – OH into a much better leaving group.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is false and ‘R’ is false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

‘A’ is true and ‘R’ is false

answer is A.

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Detailed Solution

Alcohols react with hydrogen halides to form alkyl halides. General reaction of R-OH with HX:

ROH + HX → R–X + H2O

In the above reaction if HX is HCl and dissolved in R-OH, in the presence of ZnCl₂; then the reagent called is Lucas reagent. This reaction displaces -OH (poor leaving group) with -Cl group. This reaction used to test between primary, secondary and tertiary alcohols and this test called Lucas test.

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