Difference between optically active and inactive compounds

In summary, when polarized light passes through a medium, its plane is shifted due to refraction. This is true for any solution, regardless of its optical activity. However, optically active compounds have the ability to rotate the plane of polarized light, as well as having a different index of refraction for left and right circularly polarized light. This is what sets them apart from non-optically active compounds.
  • #1
Tahmeed
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Any polarised light's plane is shifted while passing from one medium to another for refraction. So, optically active or not, a solution of any compound will cause refraction because of its density. Then what's special in an optically active compound?
 
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  • #2
It rotates the plane of polarized light.
 
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Likes gracy
  • #3
Also the index of refraction is different for left and right circularly polarised light.
 
  • #4
Bystander said:
It rotates the plane of polarized light.
Doesnt a solution of ANY matter rotates the plane of light for refraction??
 
  • #5
Tahmeed said:
rotates the plane of light for refraction

Are you sure you understand what "rotates the plane of polarized light" means?

Do you know what polarized light is?
 
  • #6
Tahmeed said:
Doesnt a solution of ANY matter rotates the plane of light for refraction??
We are not talking about refraction here, but the rotation of light while passing through a homogeneous solution.
 
  • #7
Borek said:
Are you sure you understand what "rotates the plane of polarized light" means?

Do you know what polarized light is?

Polarised light has electric and magnetic field component in only one direction?
 

What is an optically active compound?

An optically active compound is a molecule that has the ability to rotate the plane of polarized light. This means that when a beam of polarized light passes through the compound, the direction of the light is changed.

What is an optically inactive compound?

An optically inactive compound, also known as a achiral compound, is a molecule that does not have the ability to rotate the plane of polarized light. This means that the direction of the light remains the same after passing through the compound.

What causes a compound to be optically active?

A compound is optically active because it has a chiral center, which is a carbon atom that is bonded to four different groups. This uneven distribution of groups creates a three-dimensional structure that can rotate the plane of polarized light.

Can a compound be both optically active and inactive?

No, a compound can only be either optically active or inactive. If a compound has a chiral center, it is always optically active. If a compound does not have a chiral center, it is always optically inactive.

What techniques are used to determine if a compound is optically active?

The most common technique used is polarimetry, which measures the amount and direction of rotation of polarized light passing through a sample. Another technique is X-ray crystallography, which can determine the three-dimensional structure of a molecule and identify chiral centers.

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