Question

When cyclohexanone reacts with selenium dioxide, what product will be formed?

A.Cyclohexane $1,2 - $ dione
B.$1,6 - $ hexanedione
C.Cyclohexane $1,4 - $ dione
D.$2 - $ hydroxy cyclohexan $1 - $ one

Answer 1

Hint: Functional group: In the hydrogen the atoms or groups which are other than carbon and hydrogen, are known as function groups. For example: chloride if chlorine is present in the compound. And if $CO$ is attached then the functional group will be ketone.

Complete step by step solution:
First of all we will talk about the alkanes, alkenes and alkynes.
Alkanes: The compounds which are formed by carbon and hydrogen and have only a single bond between the carbon-carbon atoms, are known as alkanes. For example: The first member of the alkane family is ethane $({H_3}C - C{H_3})$. The general formula of the alkane group is ${C_n}{H_{(2n + 2)}}$.
Alkenes: The compounds which are formed by carbon and hydrogen and have at least one double bond along with a single bond between the carbon-carbon atoms, are known as alkenes. For example: The first member of the alkene family is ethene $({H_2}C = C{H_2})$. The general formula of the alkene group is ${C_n}{H_{2n}}$.
Alkynes: The compounds which are formed by carbon and hydrogen and have at least one triple bond along with a single bond between the carbon-carbon atoms, are known as alkynes. For example: The first member of the alkyne family is ethyne $(HC \equiv CH)$. The general formula of the alkyne group is ${C_n}{H_{(2n - 2)}}$.

Number of carbon atom in alkane	Name of the parent chain
One	Methane
Two	Ethane
Three	Propane
Four	Butane
Five	Pentane
Six	Hexane
Seven	Heptane

Functional group: In hydrogen the atoms or groups which are other than carbon and hydrogen, are known as function groups. For example: chloride if chlorine is present in the compound.
When cyclohexanone reacts with selenium dioxide, then the product is as Cyclohexane $1,2 - $ dione. Because the cyclohexane ring will be the same and one more ketone group will be attached to the parent chain so the IUPAC name of the product will be Cyclohexane $1,2 - $ dione. The reaction is as follows:

So the correct answer is option C.

Note: Suffix to some functional group are as: for carboxylic acid suffix used is –oic acid, for alcohols suffix used is alkyl alcohol. For example: if an alcohol group is present in methane then the IUPAC name of the compound will be methyl alcohol.