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Chapter 28: Problem 84

Enantiomers always (a) have an asymmetric carbon; (b) have different physical properties; (c) change the color of light; (d) rotate polarized light; (e) none of these.

Short Answer

Expert verified
The correct answer is (d) enantiomers always rotate polarized light.

Step by step solution

01

Understanding Enantiomers

Enantiomers are isomers, chiral molecules that are mirror images of each other. Not all enantiomers have an asymmetric carbon, it's a common feature but not a necessity. They possess the same physical and chemical properties and behave same under symmetrical environment. However, in the presence of plane-polarized light or a chiral environment, they show differences.
02

Analyzing The Options

Let's go through each statement: (a) While many enantiomers do have an asymmetric carbon, it's not a necessity for all enantiomers. (b) This isn't true, enantiomers have identical physical properties (boiling point, melting point etc) except their interaction with plane-polarized light. (c) Enantiomers don't necessarily change the color of light, but they can rotate the plane of polarization of light. (d) It's true, enantiomers do rotate polarized light, either in a clockwise (dextrorotatory) or counterclockwise (levorotatory) direction. (e) Given that statement (d) is correct, statement (e), which says 'none of these', is incorrect.
03

Determining The Correct Answer

The correct answer is therefore (d). Enantiomers always rotate polarized light.

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Most popular questions from this chapter

The following terms are all related to stereoisomers and their optical activity. Explain the meaning of each: (a) dextrorotatory; (b) levorotatory; (c) racemic mixture; (d) \((R)\).

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