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Why disaccharides obtained from monosacc...

Why disaccharides obtained from monosaccharides like glucose `(C_(6)H_(12)O_(6))` has the formula `C_(12)H_(22)O_(11)` instead of `C_(12)H_(24)O_(12)`?

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Two glucose `(C_(6)H_(12)O_(6))` units are joined along with elimination of a water molecule `(H_(2)O)` to form a disaccharide. Hence, the resulting disaccharide has the formula `C_(12)H_(22)O_(11)` rather than `C_(12)H_(24)O_(12)`
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