Question

ohc-ch2-ch=ch-cho, IUPAC name?

Answer 1

The answer is: Pent-2-ene-1,5-dial

Answer 2

The IUPAC name of OHC-CH₂-CH=CH-CHO is Pent-2-ene-1,5-dial.

The reason behind this name is as follows:

• The given compound has two functional groups of aldehyde.
• Also, it has one double bond.
• So, the carbons that need to be numbered can be from either the left or right side taking -CHO carbon as the first one.
• But while giving numbers from rightward to leftward direction, we find a double bond to be closer to -CHO.
• Thus according to IUPAC nomenclature rules, the numbering of carbon should be done from right to left.
• After numbering we get 5 carbons, so "Pent" is given.
• After that, the double bond lies in the position of the second carbon, so "2-ene" is given.
• At last, comes the position of two -CHO, so, 1,5 is added next.
• And as the functional group of -CHO is named as -al, it is added at last.
• On whole, the IUPAC name of OHC-CH₂-CH=CH-CHO is Pent-2-ene-1,5-dial.

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