Haryana PMT Haryana PMT Solved Paper-2005

  • question_answer
    The order of reactivity of the following  alcohols towards cone. \[HCl\] is:                                                                           

    A)  \[I>II>III>IV\]

    B)  \[I>III>II>IV\]

    C)  \[IV>III>II>I\]

    D)  \[IV>I>II>III\]

    Correct Answer: C

    Solution :

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


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