A student does some calculations on the HCCLi molecule. The atom X is a $$dummy$$ atom, that only serves to define the angle $\backslash$alpha $.$ She calculates the energy as a function of both r and $\backslash$alpha $,$ and makes a contour diagram.

a$)$ Estimate r and $\backslash$alpha for the three minima and two transition states.

b$)$ Estimate the reaction energies and barriers for the reactions Minimum $1->$ Minimum $2->$ Minimum $3.$