Below are the energy curves showing the change in energy as bonds are broken and

Question

Below are the energy curves showing the change in energy as bonds are broken and formed. The monochlorination of methane is done for you. Refer to the Bond Dissociation energy table (click here for the bond dissociation table) for data to help you determine the energy changes for the monobromination and monoiodination of methane. Also given are the generic reactants and products which are color-coded to match the curves.
The symbol beside the4in the chlorination diagram is a double headed arrow showing the energy difference from where it started and where it ended for the first step.

a) The energy change for A iskJ/mol
b) The energy change for B iskJ/mol
c) The energy change for C iskJ/mol
d) The energy change for D iskJ/mol
e) The energy change for E iskJ/mol
f) The energy change for F iskJ/mol
g) In alphabetical order list the energy changes (A-F) which represent endothermic (positive) energies.

Explanation / Answer

A = 69, B = 101, C = 32, D = 138, E = 84, F = 54 endo thermic changes are A,D,F

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