Question

Which of the above can show functional isomerism?

• A. $A$
• B. $B$
• C. Both $A$ and $B$
• D. None of these

Answer 1

The correct option is C Both $A$ and $B$

$\begin{array}{c}\text{The Carbon - oxygen distance was found to}\text{be}143pm\text{in compound}A\text{and}124pm\\ \text{in compound}B\text{Thus compound}A\text{has}C-O\text{single bond and}\\ \text{compound}B\text{has}C=O\text{double bond.}\end{array}$

In the above structure, both the compound have the same molecular formula but the different functional groups. In Butan-2one ketone is the main functional group present. So B will show functional isomerism.

Both A and B show functional isomerism.