# Is this an aldehyde?

$\ce{CH3CH2CH2CHO}$
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?

• that's an aldehyde – ron Feb 14 '17 at 19:29
• In an alcohol, the alcohol group would be indicated as OH in a properly written formula. – bpedit Feb 14 '17 at 19:54

That's an aldehyde as it contains ($\ce{-CHO}$) group.
$\ce{CH3CH2CH2CHO}$ 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.