  A detailed discussion on phase transition and microscopic structure of
charged AdS black hole with a global monopole is presented in both extended and
alternate phase spaces. In the analysis of critical behaviour, the classical
van der Waals analogy is drawn from isotherms which is followed by Gibbs free
energy study and coexistence curves. In both spaces, the symmetry breaking
parameter $\eta$ acts as a hindrance for critical behaviour. The crux of van
der Waals like behaviour is investigated by looking at the microscopic
structure of the black hole via thermodynamic Ruppeiner geometry. The Ruppeiner
invariant scalar behaves differently in extended and alternate spaces. The
monopole parameter influences the microscopic structure of the black hole,
which in turn, affects the critical behaviour. The effect is significant at the
maximal strength of the monopole parameter.
