Question

The IUPAC name of the compound

$H_{3}C-\underset{C_2{H}_5}{\underset{|}{CH}}-\underset{C_2{H}_5}{\underset{|}{CH}}-C{H}_3$

• A. 2, 3-diethylbutane
• B. 3, 4-dimethylhexane
• C. 2-ethyl-3-methylpentane
• D. 3-methyl-2-ethylpentane

Answer 1

The correct option is B

3, 4-dimethylhexane

$H_{3}C-\underset{C_2{H}_5}{\underset{|}{CH}}-\underset{C_2{H}_5}{\underset{|}{CH}}-C{H}_3$

$\to$ Let's determine the parent chain and number it.

Now, the compound can be written as

$H_{3}C-\underset{C{H}_3}{\underset{|}{\underset{C{H}_2}{\underset{|}{CH}}}}-\underset{C{H}_3}{\underset{|}{\underset{C{H}_2}{\underset{|}{CH}}}}-C{H}_3$ $\Rightarrow \underset{1}{C{H}_3}-\underset{2}{C{H}_2}-\underset{3}{\stackrel{C{H}_3}{\stackrel{|}{CH}}}-\underset{4}{\stackrel{C{H}_3}{\stackrel{|}{CH}}}-\underset{5}{CH}-\underset{6}{C{H}_3}$

Six carbons in parent chain $\Rightarrow rootword\to$ Hex

Only single bond is present $\Rightarrow$ Suffix$\to$ane

$\to$ There are two methyl groups present at $C_{3}and{C}_4$

Therefore, the IUPAC name of the compound is 3,4-dimethylhexane