Question

IUPAC name of $C{H}_3(C{H}_2{)}_{3}C{H}_3$ is

• A. Pentane
• B. Hexane
• C. Butane
• D. Propane

Answer 1

The correct option is A

Pentane

What should we do first?
Let's calculate the number of carbons present.
For that, let's write it in a clearer format using the bonds.

$H-\underset{H}{\underset{|}{\stackrel{H}{\stackrel{|}{C}}}}-\underset{H}{\underset{|}{\stackrel{H}{\stackrel{|}{C}}}}-\underset{H}{\underset{|}{\stackrel{H}{\stackrel{|}{C}}}}-\underset{H}{\underset{|}{\stackrel{H}{\stackrel{|}{C}}}}-\underset{H}{\underset{|}{\stackrel{H}{\stackrel{|}{C}}}}-H$

Now, five carbons are present
Only single bonds are present
Five carbon $\Rightarrow$ root word $\to$ pent
single bonds $\Rightarrow$ suffix $\to$ ane
Therefore, it is pentane.