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  4. Most stable carbocation is

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Q. Most stable carbocation is

Delhi UMET/DPMTDelhi UMET/DPMT 2011

Solution:

Primary allyl carbocation is stabilised only by resonance effect whereas secondary and tertiary allyl carbocations are stabilised by resonance, hyperconjugation and inductive effect.
$ \therefore $ The stability of carbocations in decreasing order is $ 3^{\circ} $ allyl carbocation $ > 2^{\circ} $ allyl carbocation $ > 1^{\circ} $ allyl carbocation.