During a spectroscopic evaluation of the several solutions of C6H5CH=CHCCl2 in ethanol using a 1.0cm spectrophotometric cell, different values of absorbance (A) were obtained, which are given in the following table: When the reaction of C6H5CH=CHCCl2 with C2H5O in an ethanolic medium is followed spectroscopically at a convenient wavelength (), the following results are found: The values of at and the rate constant for that reaction are: a. =1.79106dm3mol1cm1 and k=0.034dm3mol1min1 b. =1.79104dm3mol1cm1 and k=0.034dm3mol1min1 c. =1.79106dm3mol1cm1 and k=8.9103dm3mol1min1 d. =1.79104dm3mol1cm1 and k=8.9103dm3mol1min1