Electronic Displacement Effects - Problem 6
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Description:
Problem − Write the correct order of stability of carbocations given below −
Solution − The correct order of stability of the given carbocations can be understood by hyperconjugation effect and is as follows −
More the number of α −hydrogen atoms, greater dispersal of positive charge and thus, greater stability via hyperconjugation.
Vinyl carbocation is highly unstable due to the presence of positive charge on an sp2 hybridized carbon. Due to the electron-withdrawing ability of sp2 hybridization state, it destabilizes the carbocation, which is already electron-deficient.
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