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  4. The order of reactivity of the following alcohols towards conc. HCl is:

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Q. The order of reactivity of the following alcohols towards conc. $ HCl $ is:Chemistry Question ImageChemistry Question ImageChemistry Question ImageChemistry Question Image

Haryana PMTHaryana PMT 2005Alcohols Phenols and Ethers

Solution:

This is nucleophilic substitution reaction, hence stabler the carbocation, more reactive will be the alcohol. The order of stability of carbocations is: $ Ph-\overset{+}{\mathop{C}}\,{{H}_{2}}>C{{H}_{3}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}} $ $ >FC{{H}_{2}}-C{{H}_{2}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}} $ $ >FC{{H}_{2}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}} $