IMAT 2012 Q59 [Aldehydes]

Which one of the following could NOT be the formula of an aldehyde?

A. {C_6H_{12}O_2}
B. {C_5H_{10}O_2}
C. {C_5H_{10}O}
D. {C_5H_{12}O}
E. {C_6H_{12}O}

1 Like

Here it is beneficial to know the general formula for the Aldehyde group; C_nH_{2n}O.

Now all we have to do is choose which option does not satisfy our formula.

A and B are most easily eliminated because they could contain hydroxyl groups to explain for the oxygen- this does not, however, mean that they are not Aldehydes.

C is a perfectly accurate Aldehyde according to our general formula, therefore it is also not our answer.

We can see our answer becomes D because of the incorrect amount of Hydrogen for that number of Carbons.

E is also a perfectly accurate Aldehyde according to our general formula, therefore it is also not our answer.