JEE Main & Advanced Chemistry GOC Question Bank Dipole moment, Resonance and reaction intermediates

  • question_answer Which of the following species is paramagnetic in nature [NCERT 1984]

    A) Free radical

    B) Carbonium ion

    C) Carbanion

    D) All the above

    Correct Answer: C

    Solution :

               Without intermediate reaction take place as under                    \[C{{H}_{3}}-CH=C{{H}_{2}}+HBr\to C{{H}_{3}}-\overset{Br\,}{\mathop{\overset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}\]                    (According to markownikoff rule)                    But the halogen bonded with terminal carbon so it take place in presence of peroxide by free radical mechanism.                    \[\underset{\text{peroxide}}{\mathop{R-O-OR}}\,\to 2R\overset{.}{\mathop{O}}\,\]; \[HBr+\overset{.}{\mathop{RO}}\,\to ROH+B{{r}^{.}}\]                    \[C{{H}_{3}}-CH=C{{H}_{2}}+B{{r}^{.}}\to C{{H}_{3}}-C\overset{.}{\mathop{H}}\,-C{{H}_{2}}-Br\]                    \[C{{H}_{3}}-\overset{.}{\mathop{C}}\,H-C{{H}_{2}}Br+HBr\to \] \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}Br+B{{r}^{.}}\]

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