I think it is an aldehyde but I saw somewhere that it might be an alcohol...

I believe that it looks like this. Is that correct?
enter image description here

  • 5
    $\begingroup$ that's an aldehyde $\endgroup$
    – ron
    Feb 14, 2017 at 19:29
  • 2
    $\begingroup$ In an alcohol, the alcohol group would be indicated as OH in a properly written formula. $\endgroup$
    – bpedit
    Feb 14, 2017 at 19:54
  • $\begingroup$ yeah that's an aldehyde $\endgroup$ Jun 5, 2021 at 1:21

1 Answer 1


That's an aldehyde as it contains ($\ce{-CHO}$) group.

Its not an alcohol because in alcohol the carbon and oxygen bond in a single (sigma) bond whereas in aldehyde it is a double bond.

$\ce{CH3CH2CH2CHO}$ cant be a alcohol because as you can see that the terminal carbon is attached to only 3 groups ($\ce{C}$, $\ce{H}$ and $\ce{O}$) which means that it is still missing 1 bond to complete its octet. Therefore this carbon makes one more bond, a double bond, with the oxygen atom to complete its octet and the oxygen also attains a complete octet by this.


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