Identify whether each of the following compounds has one or more achiral stereoisomers.
a. butane-2,3-diol
b. pentane-2,3-diol

• A. a. Does not have an achiral stereoisomer.b. Has an achiral stereoisomer.
• B. a. Has an achiral stereoisomer.b. Does not have an achiral stereoisomer.
• C. a. Does not have an achiral stereoisomer.b. Does not have an achiral stereoisomer.
• D. a. Has an achiral stereoisomer.b. Has an achiral stereoisomer.

Answer: (B)