question_answer 78)

  Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. Name the type of intermediate formed in the first step of the following addition reaction : \[{{H}_{3}}C-HC=C{{H}_{2}}+{{H}^{+}}\to ?\] (a) \[2{}^\circ \text{ }Carbanion~~~~~~~~~\]     (b)\[~1{}^\circ \text{ }Carbocation\]       (c)\[~2{}^\circ \text{ }Carbocation\]  (d) \[1{}^\circ \text{ }Carbanion\]

Answer:

  (c) \[C{{H}_{3}}-CH=C{{H}_{2}}+{{H}^{+}}\to C{{H}_{3}}-\overset{+}{\mathop{CH}}\,-C{{H}_{3}}\] (\[2{}^\circ \]carbocation) is more stable.