12. 5B Estimating the relative stability of resonance structures a. The more covalent bonds a structure has, the more stable it is 1.3-butadiene + H2C=AA=CH2+ H2 C--CH2 H2CA-A -CH most stable because it contains more covalent bonds12.5B Estimating the relative stability of resonance structures a. The more covalent bonds a structure has, the more stable it is. H2C C H C H CH2 H2C C H C H CH2 + - H2C C H C H CH2 - + most stable because it contains more covalent bonds 1,3-butadiene