D-allose D-altrose D-arabinose D-erythrose D-fructose D-galactose D-glucose D-gu

Question

D-allose D-altrose D-arabinose D-erythrose D-fructose D-galactose D-glucose D-gulose D-¡dose D-lyxose D-mannose D-ps¡cose D-r¡bose D-ribulose D-sorbose D-tag atóse D-talose D-threose D-xylose D-xylulose Starting with an aldopentose, a chemist did two cycles of the Killiani-Fischer synthesis and then separated the products to obtain the four aldoheptoses provided in Figure 2. What sugar did the chemist start out with? You will be provided with the list shown in Figure 1 from which you'll select your answer.

Explanation / Answer

answer is D-Xylose, Kil;iani synthesis is extention of of chain , so subtracting top two carbons from above four compounds, we get one same structure i.e D- Xylose which is staring material, further refrence for you , http://en.wikipedia.org/wiki/Kiliani

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