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No. of optical isomers of glucose is:
A.8
B.16
C.32
D.4

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Answer
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Hint: Identify the number of chiral carbons to find how many stereoisomers exist. An arbitrary number (n) of chiral centres in a molecule there are as many as ${2^n}$ possible stereoisomers.

Complete step by step answer:
Let’s find the number of chiral carbons in glucose by drawing its structure.
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Glucose has four chiral carbons in its aldehyde form, and so there are ${2^4}$ or 16 possible stereoisomers of this formula. These 16 isomers are:
1.
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2. 
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3. 
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4.
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5. 
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8. 
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9.
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11. 
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12.
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13.
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14.
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15.
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   16.
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Therefore, we can conclude that the correct answer to this question is option B.

Note:
The 16 stereoisomers of glucose along with their D and L forms. The isomers with their C-5 hydroxyl group on the right are called D-, the isomers with C-5 on the left are L-isomers. Each aldohexose is the diastereomer of the other 14 isomers.