A) \[{{(C{{H}_{3}})}_{3}}C\overset{+}{\mathop{C}}\,{{H}_{2}}\]
B) \[{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,\]
C) \[C{{H}_{3}}C{{H}_{2}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]
D) \[C{{H}_{3}}\overset{+}{\mathop{C}}\,HC{{H}_{2}}C{{H}_{3}}\]
Correct Answer: B
Solution :
The order of stability of carbocation is\[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}\] [a] \[\underset{\text{(}{{1}^{o}}\text{) }carbocation}{\mathop{{{(C{{H}_{3}})}_{3}}C-\overset{+}{\mathop{C}}\,{{H}_{2}}}}\,\] [b] \[\underset{\text{(}{{3}^{o}}\text{) }carbocation}{\mathop{{{(C{{H}_{3}})}_{3}}{{C}^{+}}}}\,\] [c] \[\underset{\text{(}{{1}^{o}}\text{) }carbocation}{\mathop{C{{H}_{3}}C{{H}_{2}}\overset{+}{\mathop{C}}\,{{H}_{2}}}}\,\] [d] \[\underset{\text{(}{{2}^{o}}\text{) }carbocation}{\mathop{C{{H}_{3}}\overset{+}{\mathop{C}}\,HC{{H}_{2}}C{{H}_{3}}}}\,\] \[{{3}^{o}}\] carbocation i.e., \[{{(C{{H}_{3}})}_{3}}{{C}^{+}}\] is the most stable carbocation.
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