Imbalance

Imbalance:

 The situation in which REACTION parameters
that characterize different bond-forming or
bond-breaking processes in the same reaction have
developed to different extents as the TRANSITION
STATE is approached along some arbitrarily defined
reaction coordinate. For example, in the nitroalkane
anomaly, the Bronstedβ exponent for proton removal
is smaller than the Bronstedα for the nitroalkane
because of imbalance between the amount of bond
breaking and resonance delocalization in the transition
state. Imbalance is common in elimination, addition,
and other complex reactions that involve proton
(hydron) transfer.