A) \[C{{H}_{3}}\overset{+}{\mathop{C{{H}_{2}}}}\,\]
B) \[{{(C{{H}_{3}})}_{2}}\overset{+}{\mathop{CH}}\,\]
C) \[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\]
D) \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C{{H}_{2}}}}\,\]
Correct Answer: D
Solution :
Carbocations have sextet of electrons and are stabilized if an electron donating group (+I effect) is attached to it. Order of stability of carbocations is \[t>s>p>\overset{+}{\mathop{C{{H}_{3}}}}\,\] \[{{C}_{6}}\overset{+}{\mathop{{{H}_{5}}C{{H}_{2}}}}\,>{{(C{{H}_{3}})}_{3}}{{C}^{+}}>{{(C{{H}_{3}})}_{2}}\overset{+}{\mathop{CH}}\,>C{{H}_{3}}\overset{+}{\mathop{C{{H}_{2}}}}\,\] \[{{C}_{6}}\overset{+}{\mathop{{{H}_{5}}C{{H}_{2}}}}\,\] is stabilized due to resonance. Thus \[{{C}_{6}}\overset{+}{\mathop{{{H}_{5}}C{{H}_{2}}}}\,\] is maximum stable.
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