  Experiments involving proton-proton collisions at energies $\sqrt{s_{NN}}$ =
0.9, 2.76 and 7 TeV in Large Hadron Collider (LHC) have produced a vast amount
of high-precision data. Here, in this work, we have chosen to analyse the two
aspects of the measured data, viz., (i) the $p_T$ -spectra of pions, kaons,
proton-antiproton at above-mentioned energies, and (ii) some of their very
important ratio-behaviours, in the light of a version of the Sequential Chain
Model (SCM). The agreements between the measured data and model-based results
are generally found to be modestly satisfactory.
