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The given molecule,(1r,3R,5S)-3,5-dimethyl-4-methylenecyclohexanol , is optically inactive .This molecule has a plane of symmetry (as shown below) and, therefore, is achiral.


Imagine yourself cutting the molecule in half along the axis determined by the OH group and the double bond, perpendicular to the plane of the cyclohexane ring. Observe that the 2 halves match each other perfectly, in other words you found a plane of symmetry. For any molecule to be chiral, and thus be optically active, it must not have any plane of symmetry....


Actually, I think you have it backwards. The color you see is due to the colors of light which are removed from white light when traveling past the iron. That is, if you go and find an absorption spectrum of iron cations in different oxidation states, you will find they primarily absorb the complementary colors of the color you actually see. As far as the ...

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