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Chapter 18: Problem 17

An optically active compound (A) Rotates the plane polarized light (B) Changes the direction of polarized light (C) Do not allow plane polarized light to pass through (D) None of the above

Short Answer

Expert verified
The correct answer is (A) "Rotates the plane polarized light". Optically active compounds rotate the plane of polarization of polarized light due to the presence of chiral molecules in the compound.

Step by step solution

01

Recall the definition of an optically active compound

An optically active compound is a chemical compound that can rotate the plane of polarization of plane-polarized light. This property is due to the presence of chiral molecules in the compound which can exist in two non-superimposable configurations called enantiomers.
02

Evaluate statement A

"Rotates the plane polarized light" - This statement is consistent with the definition mentioned above. Optically active compounds rotate the plane of polarization of polarized light. The direction of rotation depends on the configuration of the chiral molecules, and it can be clockwise (called dextrorotatory) or counterclockwise (called levorotatory). Hence, Statement A is correct.
03

Evaluate statement B

"Changes the direction of polarized light" - This statement might be a bit confusing, as it can be interpreted in multiple ways. Although optically active compounds do influence the direction of the plane of polarization of polarized light by rotating it, they don't change the direction of the actual light rays. So, we can consider Statement B as not being completely accurate.
04

Evaluate statement C

"Do not allow plane polarized light to pass through" - This statement is incorrect. Optically active compounds do allow plane polarized light to pass through; they just rotate the plane of polarization as the light passes through the compound.
05

Evaluate statement D

"None of the above" - Since we have found that statement A is correct, statement D is incorrect.
06

Conclusion

Based on the analysis and evaluation of the statements, the correct answer is (A) "Rotates the plane polarized light".

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Most popular questions from this chapter

Total numbers of fringes can be seen on the screen will be (A) 2001 (B) 4001 (C) 6001 (D) 8001

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