Optical Activity Enantiomers have the same Boiling points Melting points Density. Almost all their physical properties are identical,but one exception is their effect on plane polarized light Enantiomeric compounds rotate the plane of polarized light in equal but opposite directions. Chiral compounds are called optically active compounds Optically active compounds which rotate plane polarized light clockwise (dextrorotatory)are designated (+)or d. Optically active compounds which rotate plane polarized light counterclockwise (levorotatory)are designated (- or I. Note:There is no relationship between(R)and(S)and the direction of the rotation of plane polarized light.(R) does not mean d and (+) (R)and(S)are just names from the CIP convention.(+)and(-)are experimentally observed physical properties. Ch05 Stereochemistry (landscape) Page 10Ch05 Stereochemistry (landscape) Page 10 Optical Activity Enantiomers have the same Boiling points Melting points Density. Almost all their physical properties are identical, but one exception is their effect on plane polarized light. Enantiomeric compounds rotate the plane of polarized light in equal but opposite directions. Chiral compounds are called optically active compounds. Optically active compounds which rotate plane polarized light clockwise (dextrorotatory) are designated (+) or d. Optically active compounds which rotate plane polarized light counterclockwise (levorotatory) are designated (-) or l. Note: There is no relationship between (R) and (S) and the direction of the rotation of plane polarized light. (R) does not mean d and (+). (R) and (S) are just names from the CIP convention. (+) and (-) are experimentally observed physical properties