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