Problem

For a reaction

A \rightarrow B + C

, it was found that at the end of 10 minutes from the start the total optical rotation of the system was

50^\circ

and when the reaction is complete, it was

100^\circ

. Assuming that only B and C are optically active and dextrorotatory. Calculate the rate constant of this first order reaction. (a)

0.693 \text{ min}^{-1}

(b)

0.0693 \text{ sec}^{-1}

(c)

0.0693 \text{ min}^{-1}

(d)

0.00693 \text{ sec}^{-1}