Question

Give the significance of( + )sign in the name d(+ )glucose

Answer 1

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The+ sign in the name glucose indicate the number of electrons they lose.

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Answer 2

The “D” isomer is dextrorotatory and this is indicated by a (+) sign (or sometimes confusingly by a lower case “d”) and the “L” isomer is laevorotatory and this is indicated by a (-) sign (or sometimes by a lower case “l”). So, there is only one D-(+)-glucose and one L-(-)-glucose. Also important not to confuse the hyphens and minus signs!