15.3—Optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised

Know that optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised monochromatic light in molecules containing a single chiral centre.

Use —optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised to connect the rule to the data and decision in the question.

This matters because —optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.