Question

IUPAC name of the compound
$C{H}_3-(C{H}_2{)}_4-CH-\underset{C_2{H}_5(C{H}_2{)}_2-C{H}_3}{\underset{|}{\stackrel{C{H}_3}{\stackrel{|}{C}}}}-C{H}_3$ is?

• A. $5-$ ethyl $-4$, $4-$dimethyl decane
• B. $4-$ ethyl $4$, $5$dimethyl decane
• C. $3,4-$ dimethyl $-3-$ Hexane
• D. $6,7-$ dimethyl decane

Answer 1

The correct option is A $5-$ ethyl $-4$, $4-$dimethyl decane

$C{H}_3$

${}^{10}C{H}_3{-}^{9}C{H}_2{-}^{8}C{H}_2{-}^{7}C{H}_2{-}^{6}C{H}_2{-}^5\underset{|}{CH}{-}^4\stackrel{|}{\underset{|}{C}}-C{H}_3$

$C_2{H}_5$ $3C{H}_2{-}^{2}C{H}_2{-}^{1}C{H}_3$

Numbering should be started from right side. $2$ methyl and one ethyl groups are attached $C_4$ and $C_5$ respectively. So the IUPAC name of this compound is $5-ethyl-4,4-dimethyldecane$ .