Question

The criteria for optical isomerism are:
1. The presence of at least one asymmetric carbon is essential.
2. The optical rotation is due to asymmetric carbon.
3. Non- superimposable mirror image.
4. All of the above.

Answer 1

Hint: Optical isomers are two compounds which contain the same number and kinds of atoms, and bonds, and different spatial arrangements of the atoms, but which have non-super imposable mirror images. Each non-super imposable mirror image structure is called an enantiomer.

Complete Step by step answer: First of all we should know what optical isomerism is. And then we can tell the criteria.
So optical isomers are those two compounds which contain the same number and kind of atoms, and bonds, and different spatial arrangements of the atoms, but which have non super imposable mirror images.
Optical isomers have three types. Those three types are stereoisomer, constitutional isomers and homomers.
And optical isomerism is exhibited by at least one asymmetric carbon having four different atoms or groups attached to it. The enantiomers are optically active which are non super imposable on their image so this implies that 1st and 3rd options are correct. The optically active compound shows optical rotation towards the plane polarized light so the 2nd option is also correct.

So the correct option is 4th as all of the options above are correct.

Note: Always keep in mind that enantiomers are the each pair of molecules that are mirror images of each other. That is enantiomers are the isomers which are non super imposable mirror images of each other.