A) \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]
B) \[{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,\]
C) \[C{{H}_{3}}-\underset{+}{\mathop{C}}\,{{H}_{2}}\]
D) \[{{({{C}_{6}}{{H}_{5}})}_{3}}\overset{+}{\mathop{C}}\,\]
Correct Answer: D
Solution :
\[{{({{C}_{6}}{{H}_{5}})}_{3}}{{C}^{+}}\]is the most stable. As the three \[{{C}_{6}}{{H}_{5}}^{-}\]groups attached to the carbonium ion stabilizes it due to resonance. Here the order of stability is given as follows: \[{{({{C}_{6}}{{H}_{5}})}_{3}}\overset{+}{\mathop{C}}\,>{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,>{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}>{{\overset{+}{\mathop{C}}\,}_{2}}>{{\overset{+}{\mathop{C}}\,}_{2}}{{H}_{5}}\] Hence, the correct option is [d].
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