why ZnCl2 is not needed for the tertiary alkane in the reaction:
ROH + HCl = RCl + H2O

Asked by Rahul Mishra | 6th Aug, 2014, 09:48: PM

Expert Answer:

1.Primary and Secondary alcohols reacts very slowly and at moderate rate respectivly with HCl. While tertiary alcohols undergo the reaction much more faster (Just shaking with Conc.HCl is required).

2.Zinc chloride (ZnCl2) act as a catalyst for this reaction. Lewis acid such as ZnCl2 promote reactions of HCl with primary and secondary alcohols.

3.The ZnCl2 will bind to the oxygen of the hydroxyl group with more efficiency and form the good leaving group.

Answered by Arvind Diwale | 7th Aug, 2014, 01:12: PM