Question

The value of $X$ for a $2$ -ketoheptose, when $X$ is
$X=\frac{\text{ No. of stereoisomers }}{8}$

Answer 1

Answer: 2

No. of chiral center in $2$ -ketoheptose $=4$.
No. of isomers (when terminal groups are different) $=2^4=16$
$X=\frac{16}{8}=2$