Question

Give the IUPAC names of the following: a) CH3 -CO-CH3 b) CH2 == CH - CH == CH2​

Answer 1

a) CH3 -CO-CH3

Here, there are three carbons so we will use

propan and since, carbon number 1 is a carbon of the aldehyde so al will be used. Therefore, the IUPAC name of CH3−CH2−CHO is propanal.

b) CH2 == CH - CH == CH2

the compound can’t exist as written. It would need be one the following:

two C=C double bonds - propa-1,2-diene (CH2=C=CH2)

one single & one triple bond (which would be CH3C≡CH, aka propyne or methyacetylene).

or one C=C double bond: CH3-CH=CH2, which is propene.