A) \[C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]
B) \[C{{H}_{2}}=\overset{+}{\mathop{C}}\,H\]
C) \[CH={{C}^{+}}\]
D) \[{{C}_{6}}H_{5}^{+}\]
Correct Answer: A
Solution :
The electronegativity of the carbon carrying the positive charge is maximum in \[\text{HC }\!\!{}^\text{o}\!\!\text{ }{{\text{C}}^{\text{+}}}\] followed by \[{{\text{C}}_{\text{6}}}\text{H}_{\text{5}}^{\text{+}}\text{,C}{{\text{H}}_{\text{2}}}\text{=}\,{{\text{H}}^{\text{+}}}\]and least in\[\text{C}{{\text{H}}_{\text{3}}}\overset{\text{+}}{\mathop{\text{C}}}\,{{\text{H}}_{\text{2}}}\text{.}\] Higher the electronegativity, lesser the stability. Thus, \[\text{C}{{\text{H}}_{\text{3}}}\overset{\text{+}}{\mathop{\text{C}}}\,{{\text{H}}_{\text{2}}}\]is the most Stable carbocation.
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