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Multiple Choice
Which of the following statements best describes chirality in organic molecules?
A
Chirality is the phenomenon where molecules have identical physical properties but different chemical properties.
B
Chirality is the ability of a molecule to rotate plane-polarized light.
C
Chirality is the property of a molecule having a symmetrical structure.
D
Chirality refers to the presence of a carbon atom bonded to four different groups, resulting in non-superimposable mirror images.
Verified step by step guidance
1
Understand the concept of chirality: Chirality in organic chemistry refers to a molecule's property where it cannot be superimposed on its mirror image. This is similar to how left and right hands are mirror images but not identical.
Identify the key feature of chiral molecules: A chiral molecule typically contains a carbon atom bonded to four different groups. This carbon is known as a chiral center or stereocenter.
Differentiate between physical and chemical properties: Chiral molecules often have identical physical properties (like melting point and boiling point) but can have different chemical properties, especially in reactions with other chiral substances.
Recognize the effect on plane-polarized light: Chiral molecules can rotate plane-polarized light, a property known as optical activity. This is a common method to identify chirality in a laboratory setting.
Clarify the symmetry aspect: Chiral molecules are asymmetrical due to the presence of a chiral center, which is why they have non-superimposable mirror images. Symmetrical molecules, on the other hand, are typically achiral.