Question

Which one of the following molecules would have the largest bond dissociation energy if all bonds in the molecule are broken? CO, N2,O2,HCN

Answer 1

The molecule with the largest bond dissociation energy is HCN.

Step-by-step explanation:

The molecule that would have the largest bond dissociation energy if all bonds in the molecule are broken is HCN.

The dissociation energy is a measure of the strength of a bond and is related to the amount of energy required to break a bond. In the case of HCN, the bond between the carbon and the hydrogen is a triple bond, which is stronger than the bonds in the other molecules mentioned.

Therefore, HCN would have the largest bond dissociation energy.

Answer 2

N2 has the largest bond dissociation energy among the molecules listed; it possesses a very strong triple bond between two nitrogen atoms, with a bond energy of about 941 kJ/mol.

Step-by-step explanation:

Among the molecules CO, N2, O2, and HCN, the molecule with the largest bond dissociation energy when all bonds are broken is N2. The molecule N2 has a triple bond between two nitrogen atoms, which is one of the strongest chemical bonds known. The bond dissociation energy for the N≡N triple bond is about 941 kJ/mol, which is significantly higher than for the other molecules listed. In contrast, the molecules CO and O2 have double bonds (with CO having a C≡O triple bond), and HCN has a triple bond between C and N but also a C-H bond which is known to have lower bond dissociation energy (approximately 415 kJ/mol).