Question

Which one of the following pairs represents stereoisomerism?
A. Chain isomerism and the rotational isomerism
B. Structural isomerism and geometrical isomerism
C. Linkage isomerism and geometrical isomerism
D. Optical isomerism and geometrical isomerism

Answer 1

Hint: To know this answer we need to have information about isomerism and isomers and its types. Stereoisomerism is a type where compounds differ in the arrangement of atoms in three dimensional space.

Complete step by step answer:
Let’s first start with revising about isomerism.
Isomerism is the phenomenon in which more than one compound has the same chemical formula but different chemical structures. Chemical compounds that have identical chemical formulas but have different properties and the arrangement of atoms in the molecule are called isomers. There are two types of isomerism which are Structural isomerism and Stereoisomerism.
Structural isomerism refers to the compounds that differ in their connectivity between the atoms and stereo isomerism refers to the compounds with same exact molecular formula and connectivity but differ in the arrangement of atoms in three dimensional space. Structural isomerism can be further divided into Chain isomers, Position isomers and functional isomers and Stereoisomers can be divided into Geometric isomers and Optical isomers.

Therefore, the answer is Optical and Geometric isomers and the correct option is D.

Additional Information:
Optical isomers are compounds which contain the same number and kinds of atoms and bonds and are different spatial arrangements of the atoms but have non superimposable mirror images. Each non-superimposable mirror image structure is called an enantiomer.
Geometric isomers are compounds that are locked into their spatial positions with respect to one another due to a double bond or a ring structure. It is also called as Cis and Trans isomerism.

Note:
Having information about every type of isomerism is important as each type specifies different properties of compounds.