Can someone explain? I was going over infixes and it said "an" mean single bonds, but I see a double bonded carbon to oxygen. I know its an aldehyde but I don't understand why its not spelled ethenal?

Question

The InfixThe infixindicates the presence of just single bonds, one or more double bondsor one or more triple bonds.We must know these infixes listed in Table 5.Table 5. IUPAC InfixesInfixBondsanall single or

Answer 1

Hard to say too much on this because something you tried to include with your question is not displaying properly. There is no such compound, ethenal. There is, however, ethanal, which is essentially ethane with a carbonyl group.

"Ethenal" implies a carbon-carbon double bond AND a carbonyl group, which isn't going to form. Google structures for ethanal and propenal (Acrolein), and I think you'll see this more clearly.