(B) Fructose $(C_6H_{12}O_6)$ is a ketohexose containing $3$ chiral carbon atoms.The number of optical isomers is given by the formula $2^n$,where $n$

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(B) Fructose $(C_6H_{12}O_6)$ is a ketohexose containing $3$ chiral carbon atoms.The number of optical isomers is given by the formula $2^n$,where $n$ is the number of chiral centres.Here,$n = 3$,so the number of optical isomers = $2^3 = 8$.Therefore,the correct option is $(B)$.