a. F: necessarily. This statement is true only for a compound with one chiral `C` but not for more than one `C` atom. For example
b. F: The terms `D` and `L` do not refer to sign of rotation. They refer to the configuration of stereoisomer relative to that of `D` glyceraldehyde.
c. T: Changing the configuration at one of the chiral centres converts one diastereomer to the other.
d. T: Unlike a racemate, meso and chiral compounds cannot be resolved beacuse they do not consist of enantiomers.
e. T: Only by breaking a bond the configuration can be changed. f. F: The product could be meso or achiral.
g. F : If an optically active achiral coreactant, solvent, or catalyst such as enzyme is used, the product is likely to be `O.A`.
h. F: The priority sequence of ligands may change.
i. F: The racemate shows no optical activity.
j.T: For example, meso compound
k. F: Sign of rotation is not related to the configuration.