Q. Which of the following molecules is expected to rotate the plane of plane-polarized light?

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Solution:

The plane of polarized light is rotated by optically active compound, i.e. it should be chiral. So, (1) has, chiral C-atom. So, it is optically active.
In (2), (3) and (4) plane of symmetry is present.
Hence, (1) is correct.