Nomenclature Systems Of Geometrical Isomers|Priority Rules (CIP Sequence Rule)|Examples|Optical Isomerism|Plane Polarised Light|Chiral Centre|Questions|Asymmetric Molecule|Plane Of Symmetry|Centre Of Symmetry|Questions|Projection Formula|Fischer Projection|Relative Configuration (D/L)|Threo & Erythro System|Enantiomers|Diastereomers|Meso Compound|Racemic Mixture|Conformational Isomerism|Representation Of 3-D Molecules|Stability Factor Of Conformers|Conformers Of Ethane|Potential Energy Graph|OMR

State whether the following statements are true or false. a. D and L stereoisomers are enantiomers. b. D enantiomer rotates the plane-polarised light to the right and L enantiomer to the left. c. Conversion of an erythro to a threo stereoisomer always occur by inversion at one chiral C . d. A racemate can be distinguished from a meso or a chiral compound by an attempted resolution. e. Racemisation of an enantiomer can only occure by breaking of at least one bond to the chiral centre. f. A reaction catalysed by an enzyme always gives an O.A product. g. When an achiral molecule reacts to give achiral molecule, the product is always racemic h. In chemical reactions, the change from an S reactant to an R product always signals an inversion of configuraion. i. An optically inactive substance must be achiral. j. An achiral compound can have chiral centres. K. A compound with S configuration is the (-) enantiomer.