8.
What product(s) is (are) obtained from a Kiliani-Fischer synthesis starting with D-erythrose?
(a) D-lyxose and D-xylose
(b) D-glyceraldehyde
(c) D-ribose and D-arabinose
(d) D-erythrose and D-threose
Answers
Answer:
Kiliani-Fischer synthesis starting with D-erythrose forms D-ribose as well as D-arabinose.
Explanation:
Kiliani-Fischer synthesis is a method that is usually used for the production of sugars that are difficult or impossible to obtain from natural sources. This reaction involves the addition of cyanide ion to an open-chain aldehyde (in the case of aldoses) which is then partially reduced and then hydrolyzed to give a new aldehyde.
When D-erythrose undergoes the Kiliani-Fischer synthesis it forms D-ribose and D-arabinose as the product.
The sugars D-ribose and D-arabinose are not obtained from nature, they can be formed using the D-erythrose.
Hence, it can be concluded that D-erythrose forms D-ribose and D-arabinose by Kiliani-Fischer synthesis. Hence, the correct option is (c) D-ribose and D-arabinose.
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