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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Suman Kumar
stability order 3>2>1>4>5
structure 3 has resonance of 2 pi bond as well as hyperconjugation
structure 4 has hyperconjugation. But structure 5 has localised radical
Radical stability is treated same as carbocation stability. Keep this point in mind
How structure 4 has 4 alpha H Neha?
First of all it is unstable as it is located on sp2 hybridized carbon. So highly unstable but it is stabilized by hyperconjugation
please mark thankyou 🙏 Neha