Question

Give the IUPAC name of the folllowing compound CH2=CH-CH2- CHO

Answer 1

4 Carbons makes this a But-

CHO makes it an Alkanal, and numbering of the chain begins here.

C=C makes it an "ene", the double bond is at the 3rd position from the CHO end.

But-3-ene-al

Answer 2

IUPAC name of $CH_2=CH-CH_2CHO$ is But-3-en-1-al.

Explanation:

• The longest chain containing the functional group is of 4 carbon atoms. Therefore, root word is -But.
• As C=C is present at 3 carbon in the molecule, thus suffix -ene must be used.
• The secondary suffix is -al because of the presence of -CHO group.
• The chain is numbered as shown in attachment so that carbon atoms of '-CHO' group gets number 1.
• Thus the IUPAC name of $CH_2=CH-CH_2CHO$ is But-3-en-1-al.

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