Explain the following observation C2H5 CH5 solvent CH3- C- CI + NaOCHs CH3- C-OCHs H H [a] = +16.50 When the above reaction was examined using two

I have difficulties solving this question, far as i can see it is a substitution reaction, but i don't understnd why there is no optical activity when repalced DMSO with ethanol.

Explain the following observationC2H5CH5solventCH3- C- CI+ NaOCHsCH3- C-OCHsHH[a] = +16.50When the above reaction was examined using two different solvents (DMSO and ethanothe following observations were made.When DMSO was used the product formed was optically pure and a Levorotatory.However, when the solvent was changed to ethanol, the product showed no opticalactivety, [X] = 00. Why?a). Explain this observation clearly.b) Show the reaction mechanism for the reaction in DMSO