Which of the highlighted chemical bonds in the molecules below is longest? shortest? in between? which highlighted bond requires the highest energy to break? lowest? in between? answer these questions by completing the second and third columns in the table. compoundlength of highlighted bondenergy of highlighted bond?

Although the options are not provided, I was able to find the question. The compounds under consideration are hydrazine, diazene and nitrogen gas. In these compounds, the bonds between the nitrogen atoms are being considered.

The bonds, in order from longest to shortest are:
N-N in hydrazine; N=N in diazene and N≡N in nitrogen gas

The order from weakest to strongest bond is:
N-N in hydrazine; N=N in diazene and N≡N in nitrogen gas

The reason for this is because the more the electrons that are shared across a bond, the shorter the bond becomes due to charge density and also becomes stronger.

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The mass has escaped into a gas which you can not see so the law stays true.