Chemical Kinetics

For a reversible reaction R P, at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants kf and kb, respectively. At time zero, the concentration of R is [R]0 and the concentration of P is zero. At any given time, [R] and [P] are the concentrations of R and P, respectively. If kb = 4kf, the correct graphical representation of the reaction is

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