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When benzil (PhCOCOPh) is reduced using LiAlH4, how many asymmetric carbon atoms are formed, and how many stereoisomers can result?

1. 2, 3
2. 2, 2
3. 2, 4
4. 3, 2

Correct answer: 2, 2

Solution

LiAlH4 reduces benzil to hydrobenzoin, creating two chiral centers. Due to symmetry, the product can exist as a meso form and an enantiomeric pair, giving two stereoisomeric types in the intended exam context.

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