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What is the correct order of decreasing stability of the following cations?
(i) II > I > III
(ii) II > III > I
(iii) III > I > II
(iv) I > II > III
Answers (1)
(i) II > I > III
Explanation: In the case of (I) +vely charged C is attached to two alkyl groups and so +I effect stabilises the carbocation. In the case of (II) +R effect of group stabilises the carbocation. In the case of (III), - I effect of
gp, destabilises the carbocation; hence, the order of stability will be such: II > I >III.
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