question_answer 1)

Which of the following carbocation is most stable? (a) \[{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{CC{{H}_{2}}}}\,\] (b) \[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\] (c) \[C{{H}_{3}}C{{H}_{2}}\overset{+}{\mathop{C{{H}_{2}}}}\,\] (d) \[C{{H}_{3}}\overset{+}{\mathop{C}}\,HC{{H}_{2}}C{{H}_{3}}\]  

Answer:

(b) i.e.,\[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\] (\[3{}^\circ \]carbocation) because the order of stability of carbocation is:\[~3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }1{}^\circ .\] \[[\left( a \right)\text{ }is\text{ }1{}^\circ \text{ }\left( b \right)\text{ }is\text{ }3{}^\circ \text{ }\left( c \right)\text{ }is\text{ }1{}^\circ \text{ }\left( d \right)\text{ }is\text{ }2{}^\circ \]carbocation].