Question

Esters are functional isomers of:

• A. hydroxy aldehyde
• B. ketone
• C. diketone
• D. diol

Answer 1

The correct option is A hydroxy aldehyde

The molecular formula of esters is: $RCCO{R}^{\prime }$

For example: $C{H}_3-\stackrel{\stackrel{O}{||}}{C}-OC{H}_3$ $\left(C_3{H}_6{O}_2\right)$

Hydroxyaldehyde example: $C{H}_3-\underset{\underset{OH}{|}}{CH}-CHO$ $\left(C_3{H}_6{O}_2\right)$

Ketone: $C{H}_3-\stackrel{\stackrel{O}{||}}{C}-C{H}_3$ Diketone: $C{H}_3-\stackrel{\stackrel{O}{||}}{C}-\stackrel{\stackrel{O}{||}}{C}-C{H}_3$ Diol: $C{H}_3-\underset{\underset{OH}{|}}{CH}-\underset{\underset{OH}{|}}{C{H}_2}$

From the above examples we can conclude that esters are functional isomers of hydroxy aldehyde as both have same molecular formula.