Which is a secondary alcohol compound and is optically active is a 2-pentanol compound. It is said to be optically active because it has one asymmetric carbon atom, namely the C atom which binds 4 different groups, namely -CH3, -OH, -H, -CH2-CH2-CH3.
Carbohydrates are also optically active and some carbohydrates can rotate the plane of polarization of light.
Compounds that are optically active are compounds that can rotate the plane of polarization. A compound is optically active if it has asymmetric C or chiral C atoms. Asymmetric C atoms are C atoms that are bonded to four different elements or molecules.
If an optically active compound has asymmetric atoms or chiral C atoms in the compound, the compound is called an optically active compound. However, not all compounds that have chiral atoms are optical, because if the atom has a plane of symmetry or a plane that can be folded in half with the same side, it means that it is not an optical compound.
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