# In an "aldehyde", WHERE does the "carbonyl" function lie?

Dec 22, 2016

#### Answer:

At the END of a hydrocarbyl chain........

#### Explanation:

An $\text{aldehyde}$ contains the $R - C \left(= O\right) H$ and thus is has to be at a chain terminus. On the other hand, a carbonyl group that is flanked by 2 alkyl groups (or non-hydrogen) groups is a $\text{ketone}$. $\text{Aldehydes}$ tend to be much more reactive than ketones in that steric access to the carbonyl centre is greatly improved.