Nature of bonding in organic compounds

Nature of bonding in organic compounds

1) Stability of resonating structures in combination of hybrid resonance:

1)

 More stable structure has more covalent bond hence more contribution.

2) If same number of covalent bond is present then uncharged structure is more stable.

3) Two unlike isolated charges close to each other are major contribution than far. 

  4) Negative charge at more electronegative atom & positive charge at more electropositive atom the structure is more stable.

 5) Equivalent resonating structure has equivalent energy & non-equivalent energy do not have same energy.

 6) 1= Isovalent resonating structure (Two Lewis structures are known as isovalent if they possess the same number of bonds) are more important than heterovalent resonating structure (Two Lewis structures are known as heterovalent resonance if they differ by one or more bonds). So 1 is more stable than 2 & 3.

 7) Electron deficient species has less electron than to complete octet hence low stable but having high energy. Hence contribution in resonance hybrid is more.