Which of the following is optically inactive?
a. equimolar mixture of enantiomers
b. Solution of pure enantiomer
c. Mixture of enantiomers with enantiomeric excess of one isomer
d. Molecule without symmetry elements
a. equimolar mixture of enantiomers
b. Solution of pure enantiomer
c. Mixture of enantiomers with enantiomeric excess of one isomer
d. Molecule without symmetry elements