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Which of the following alcohol will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

Answers (1)

The tertiary alcohol reacts the most with concentrated HCl, as the tertiary carbocation is most stable. Therefore, for tertiary alcohol, the room temperature is enough for the reaction. However, for primary and secondary alcohols, there is a need for the presence of a catalyst (ZnCl_2).

Hence option (iv) is correct. 

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