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I am facing difficulty in the following problem.

The carbocation which is most stabilised among the following is …

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In my view c) should be most stabilised because even if one hydrogen is abstracted it will help in restoring the aromatic character. However my book gives the answer as a).

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    $\begingroup$ "extent of delocalisation"? $\endgroup$ – Eashaan Godbole Dec 25 '16 at 19:30
  • $\begingroup$ @EashaanGodbole oh yes,I did not think about that.a) is more delocalised than c).thanks. $\endgroup$ – Pink Dec 25 '16 at 19:47
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    $\begingroup$ @aniline You may answer your own question. However, we are looking for long answers that provide some explanation and context. Do not just give a one-line answer; explain why your answer is right, ideally with citations. $\endgroup$ – Loong Dec 25 '16 at 21:08
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The carbocation a) is mostly stabilised because it has maximum resonance structures which leads to maximum delocalisation of the charge.

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None of the others has so many resonance structures.Therefore a) is most stable.

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    $\begingroup$ You could improve this self-answer by adding that c) is only diallylic while b) is monoallylic and d) is nonstabilised with the corresponding resonance structures ;) But happy hat. $\endgroup$ – Jan Dec 26 '16 at 12:50

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