Question

$C_5{H}_{10}O$ is a carbonyl compound. The number of structural isomers possible for this molecular formula are

• A. $5$
• B. $8$
• C. $6$
• D. $7$

Answer 1

Answer: (D)

The chemical formula of the given compound is $C_5{H}_{10}O$ .
This chemical compound is similar to aldehydes and ketones. Then all isomers of the given compound are either aldehyde or ketones. Also, we know that oxygen formed a double bond with a carbon atom.

As shown in the above figure aldehydes and are formed with the same molecular formula and all compounds are isomers of each other. Also, the number of atoms of each element is the same in all compounds shown in the figure but there is a different molecular structure for each compound.
There are four aldehydes and three ketones that exist with the chemical formula $C_5{H}_{10}O$ .
Hence, there are seven structural isomers of $C_5{H}_{10}O$ .