# Does resonance destabilize a molecule?

According to this table, more heat is released in breaking a single double bond in 1,3-butadiene than in trans-2-butene. Does this mean that the resonance of 1,3 butadiene leads to a destabilization of the compound?

• Your comparison is not correct. You are comparing two molecules with difference in internal bonding. You will not get trans-2-butene by removing 1 double bond from 1,3-butadiene. You should have compared 1-butene and 1,3-butadiene. Theoretically, addition of one double bond to 1-butene should give 1,3-butadiene, i.e. $\Delta H^0_{theo} = -60.6$ kcal/mol. But practically it is lesser ($-57$ kcal/mol) due to its higher stability due to conjugation. – Soumik Das Nov 11 '18 at 6:08