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What is no bond resonance?
The orbital interactions between the pi system and the adjacent sigma bonds of the substituent group in an organic molecule is described by hyper conjugation(no bond resonance ) .The relative stability of various classes of carbonium ions may be explained by the number of no bond structures that can be written for them .Such structures are arrived at by shifting the bonding electrons from an adjacent C-H bond to the electron deficient carbon .In this way the positive charge originally on carbon is dispersed to the hydrogen .This manner of electron release by assuming no bond character in the adjacent C-H bond is called no bond resonance .The more hyperconjugation structures (no bond resonance )that can be written for a species .For example ,
(1) Ethyl carbonium ion is stabilised by three hyper conjugation structures .


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