How many compounds rotate the plane of plane polarised light?

Question

TestHub · Accepted Answer

To find the number of compounds that rotate plane-polarized light, we look for optically active (chiral) molecules that lack both a plane of symmetry ( $P_{s}$ ) and a center of symmetry ( $C_{s}$ ).

Optically Active (7 compounds):

(a), (h): Spiro compounds with asymmetric arrangements that break all internal symmetry planes.

(c), (g): Allene and alkylidene systems with perpendicular groups that lack a plane of symmetry.

(d): Non-planar, asymmetric ring system lacking symmetry.

(e), (i): Contain chiral carbons with asymmetric configurations (non-meso).

Optically Inactive (2 compounds): (b) and (f) both possess an internal plane of symmetry ( $P_{s}$ ), making them achiral.

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