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Give the correct stability order of the following species : |
Answer» Solution :(i) `(I)` is most stable, since it is stabilised by resonance and has six `alpha-H` atoms (HYPERCONJUGATION).  (ii) `(III)` is less stable than `(I)` but more stable than `(II)` and `(IV)`, since it is ALSO stabilised by resonance and has three `alpha-H` atoms (hyperconjugtion).  (iii) `(II)` is more stable than `(IV)` and is stabilished only be hyperconjugative structure (FIVE `alpha-H` atoms).  (IV) is least stable, it has only two `alpha`-H atoms.  the stability ORDER is : `I gt III gt II gt IV`. |
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