
Concept explainers
Interpretation: The structure of 2,3,4,5,6-pentahydroxylhexanal has to be drawn.
Concept Introduction:
In aldehydes, the carbonyl group is attached at the end of the hydrocarbon chain. The carbonyl carbon is bonded to atleast one hydrogen.
Aldehydes have a general formula of

Answer to Problem 70A
The structure of 2,3,4,5,6-pentahydroxylhexanal is,
Explanation of Solution
The compound 2,3,4,5,6-pentahydroxylhexanal is an aldehyde. Aldehydes are organic compounds that have a carbonyl carbon attached to atleast one hydrogen atom. The general formula of aldehyde is
The general structure of an aldehyde is,
Where,
In 2,3,4,5,6-pentahydroxylhexanal,
The parent chain is hexane (six carbon atoms), since it is an aldehyde it becomes hexanal.
The carbonyl carbon occupies the first position.
The prefix “penta-” in pentahydroxyl shows the presence of five-hydroxyl groups.
The substituent hydroxyl is placed in the second, third, fourth, fifth and sixth positions.
The structure of 2,3,4,5,6-pentahydroxylhexanal is,
The structure of 2,3,4,5,6-pentahydroxylhexanal is,
Chapter 20 Solutions
World of Chemistry, 3rd edition
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