Question
The number of stereoisomers formed in a reaction of $(±)\mathrm{Ph}(\mathrm{C}=\mathrm{O}) \mathrm{C}(\mathrm{OH})(\mathrm{CN}) \mathrm{Ph}$ with $\mathrm{HCN}$ is ___________.
$\left[\right.$where $\mathrm{Ph}$ is $-\mathrm{C}_{6} \mathrm{H}_{5}$]
Correct Answer
3