Q. The open-chain glucose, (an aldohexose) and fructose (a 2-oxohexose) have X and Y chiral carbons respectively. Find the sum of X + Y.

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Answer: 7

Solution:

Open-chain glucose,

Solution and open-chain fructose,

Solution has three chiral carbons.

Hence sum of X + Y = 4 + 3 = 7.