A) \[R-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{H}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>H-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,\]
B) \[R-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{H}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>H-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,\]
C) \[R-\underset{H}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>H-\underset{H}{\overset{n}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,\]
D) \[R-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{H}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>R-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,>H-\underset{H}{\overset{n}{\mathop{\underset{|}{\overset{|}{\mathop{{{C}^{+}}}}}\,}}}\,\]
Correct Answer: A
Solution :
Carbonium ion is deficient of electron and is stabilised if any electron donating group (\[+I\] group) is attached to it. \[-C{{H}_{3}}\] being electron donating stabilises the carbonium ion. More the number of alkyl group greater will be the stability of carbonium ion \[{{R}_{3}}{{C}^{+}}>{{R}_{2}}H{{C}^{+}}>R{{H}_{2}}{{C}^{+}}>{{H}_{3}}{{C}^{+}}\] \[t>s>p>-C{{H}_{3}}\]
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