a. Which of the following statements concerning a pair of geometrical isomers are correct? (1) They have different boiling points and melting points. (2) They have the same relative molecular mass. (3) Their atoms are joined in the same order. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) b. Which of the following statements concerning enantiomers is INCORRECT? A. If a pair of enantiomers is present in the same amount, the mixture is optically inactive. B. A pair of enantiomers has the same melting point. C. There is at least one plane of symmetry in the molecules of enantiomers. D. A pair of enantiomers has the same molecular formula.

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Stereochemistry and Isomerism

Stereochemistry deals with the three-dimensional structure and properties of molecules. It explains the arrangement of atoms and their manipulation within a molecule in a 3D structure. Stereochemistry can be dealt with all types of molecules. Based on the stereochemistry of a molecule, the physical and chemical properties of the molecules vary.