Enthalpy of formation and bond energies of CH2(OH)2?
Firstly, regarding the bond energy, you will have to specify exactly what bond you are talking about, you can't ask for the bond energy of a compound because compounds have many bonds. This doesn't apply for diatomics (for example, you can ask what the bond energy of $\ce{N2}$ is; although that is loose usage of terminology, the meaning is clear). But methanediol is obviously not a diatomic.

Secondly, from what I understand, you need to find the enthalpy change for the hydration of formaldehyde: $\ce{CH2O_{\;(aq)} + H2O_{\;(l)} -&gt; CH2(OH)2_{\;(aq)}}$ and your approach was to find the enthalpies of formation of the individual compounds. That's a good idea and more often than not, it works because  enthalpies of formation are widely tabulated and easy to find. But it's often worthwhile just searching for the enthalpy change of the reaction you are interested in, especially if it is a relatively well-known or simple reaction (like this one). Anyway, this recent paper gives the value of $\Delta _{\text{r}}H$ for the reaction above as $-39.0 \text{ kJ mol}^{-1}$.