Question

lUPAC name of $\left(C{H}_3{)}_{2}CHCH\right(C{H}_3{)}_2$ is:

• A. $2.2$-dimethylbutane
• B. $2.3$-dimethylbutane
• C. $2.4$-dimethylbutane
• D. $1$-methylpentime

Answer 1

Answer: (B)

$2.3$-dimethylbutane

${CH}_3-CH-HC-{CH}_3||{CH}_3{CH}_3$

Methyl substituent is present at 2nd and 3rd carbon in parent chain so prefix would be $2,3$-dimethyl and the parent chain contains $4$ carbon therefore suffix would be butane.