Question

IUPAC name of the following compound:

${CH}_3-{CH}_2-\underset{C{H}_{2}C{H}_3}{\underset{|}{C}H-}C{H}_2-\underset{C{H}_3}{\underset{|}{C}H}-C{H}_2-C{H}_3$

• A. 3-Ethyl-5-methylheptane
• B. 5-Ethyl-3-methylheptane
• C. 1,1-Diethyl-3-methylpentane
• D. 3-Methyl-5,5-diethylpentane

Answer 1

The correct option is A 3-Ethyl-5-methylheptane

The given structure formula can be written as:

As per rule numbering will start from the end, giving the lowest number to an ethyl group.

Thus we have,$Ethyl\left(C_2{H}_5\right)$ is at number 3 , $methyl\left(C{H}_3\right)$ is at number 5, with a total 7 C in the chain giving heptane.

Thus, its IUPAC will be:

$3-Ethyl-5-methylheptane.$

Thus option A is correct.