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Chemistry Question on Alcohols

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

A

I>II>III>IVI>II>III>IV

B

I>III>II>IVI>III>II>IV

C

IV>III>II>IIV>III>II>I

D

IV>I>II>IIIIV>I>II>III

Answer

IV>III>II>IIV>III>II>I

Explanation

Solution

This is nucleophilic substitution reaction, hence stabler the carbocation, more reactive will be the alcohol. The order of stability of carbocations is: Ph−C+ H2>CH3−C+ H−CH3Ph-\overset{+}{\mathop{C}}\,{{H}_{2}}>C{{H}_{3}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}} >FCH2−CH2−C+ H−CH3>FC{{H}_{2}}-C{{H}_{2}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}} >FCH2−C+ H−CH3>FC{{H}_{2}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}}