The specific rotation of a pure enantiomer is +16 o . The observed rotation, if it is isolated from a reaction with 25% racemisation and 75% inversion is

Question

The specific rotation of a pure enantiomer is +16 o . The observed rotation, if it is isolated from a reaction with 25% racemisation and 75% inversion is, + 12 o, − 12 o, 4 o, − 4 o

MARKS App · Accepted Answer

Specific rotation of inverted isomer = − 16 o Angle of rotation = ( S p e c i f i c r o t a t i o n o f i n v e r t e d i s o m e r ) × ( F r a c t i o n o f i n v e r s i o n ) = − 16 × 75 100 = − 12 o

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