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If number of aldose, ketose, furanose and pyranose units present in maltose are p, q, r, s respectively. Find the value of p+q+r+s

ChemistryBiomoleculesJEE Main
Solution:
1270 Upvotes Verified Answer
The correct answer is: 4
Monomer of maltose is α -D-glucopyranose. It is disaciharide, so 2 aldose and 2 pyranose forms are present in maltose.
Hence, p = 2, q = 0, r = 0 and s = 2
So, sum of p + q + r + s = 2 + 0 + 0 + 2 = 4.

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