where The transmission characteristics for n = 1 to 12 acenes in both CSS and OSS state is presented in Figure . As for polyacenes, we have previously reported that acenes with meta connection to electrodes lead to suppression of conductance as compared to their para connected analogs due to destructive quantum interference (DQI), which further intensify with increasing molecular length. Thus, taking into consideration the fundamental role played by QI effects, we have examined acenes with both para and meta connections to Au electrodes (Figure ). Figure shows the transmission spectra for n = 1 to 6 acenes in CSS state and OSS state, wherein the frontier orbital energies are marked with arrows. The evolution of transmission spectra and frontier orbital energies reveals several trends with competing effects on conductance. The first is shifting of frontier orbital energies and the corresponding transmission peaks towards the Fermi energy with increase in n. Thereby, decreasing the energy gap between frontier peaks (ε) with increasing molecular length, which acts to increase the conductance. The second is the increase in number of resonant peaks appearing in conductance spectra with the increment of the length which also favours the increase in conductance. This is in line with the increase in density of MOs with increasing n, as illustrated in orbital energy diagram plot (Figure in SI). The other competing factor is the broadening of the frontier resonant peaks (τ ), which results from the coupling of molecular states to the extended states of the electrode. Although, the two factors, (τ ) also decreases simultaneously along the series. This can be directly inferred from the spatial distribution of MOs (Figure in SI) which reveals that orbital coefficients falls off quickly at the terminal connecting sites with increasing length which eventually results in weak coupling with electrodes. The decrease in energy gap (ε) acts to increase the conductance, while the decrease in width of frontier peaks (τ ) acts to decrease the conductance.