What are some situations in which you would expect the product of a reaction to produce enantiomers or diastereomers? for example, in an SN1 reaction where the nucleophile attacks a planar carbocation--if that carbon becomes chiral, would that reaction produce a set of enantiomers? What if you reduce a ketone to an alcohol, using LiAlH4? Could that produce a set of enantiomers? Are there any other common reaction scenarios that are useful to know about which might produce stereoisomers?