  Neutrino Physics is a mature branch of science with all the three neutrino
mixing angles and two mass squared differences determined with high precision.
Inspite of several experimental verifications of neutrino oscillations and
precise measurements of two mass squared differences and the three mixing
angles, the unitarity of the leptonic mixing matrix is not yet established,
leaving room for the presence of small non-unitarity effects. Deriving the
bounds on these non-unitarity parameters from existing experimental
constraints, on cLFV decays such as, $ \mu\rightarrow e\gamma $, $
\mu\rightarrow \tau\gamma $, $ \tau\rightarrow e\gamma $, we study their
effects on the generation of baryon asymmetry through leptogenesis and neutrino
oscillation probabilities. We consider a model where see-saw is extended by an
additional singlet $ S $ which is very light, but can give rise to
non-unitarity effects without affecting the form on see-saw formula. We do a
parameter scan of a minimal see-saw model in a type I see-saw framework
satisfying the Planck data on baryon to photon ratio of the Universe, which
lies in the interval, $5.8\times 10^ {-10} < Y _{B} < 6.6 \times 10^ {-10}
(BBN)$. We predict values of lightest neutrino mass, and Dirac and Majorana
CP-violating phase $ \delta_{CP} $, $ \alpha $ and $ \beta $, for normal
hierarchy and inverted hierarchy for one flavor leptogenesis. It is worth
mentioning that all these four quantities are unknown yet, and future
experiments will be measuring them.
