How will you distinguish between unpolarised light and polarised light?

Can our eye distinguish polarised light from unpolarised light?

How will you distinguish between ethanol and acetic acid ?

Which special characteristic of ligth is demonstrated only by the phenomenon of polarisation?Distinguihs clearly between linearly polarised light and unpolarised light.

What is linearly polarised light?

How will you distinguish between acetaldehyde and acetone ?

How will you distinguish between Vinyl chloride and ethyl chloride ?