Which of the following is the correct IUPAC name?

Question

Which of the following is the correct IUPAC name? (A) 3-Ethyl-4,4-dimethylheptane (B) 4,4-Dimethyl-3-ethylheptane (C) 5-Ethyl-4,4-dimethylheptane (D) 4,4-Bis(methyl)-3-ethylheptane

Tardigrade Admin · Accepted Answer

While writing the name of the substituents in alphabetical order, the prefixes such as di, tri, tetra, penta, hexa, etc. are not considered. Therefore, as "e" of ethyl comes before "m" of dimethyl thus, lower locant 3 assigned to ethyl group and is written first. Hence, the correct IUPAC name is 3-Ethyl-4,4-dimethylbutane.

Q. Which of the following is the correct $I U P A C$ name?

$3$ -Ethyl- $4, 4$ -dimethylheptane

$4, 4$ -Dimethyl- $3$ -ethylheptane

$5$ -Ethyl- $4, 4$ -dimethylheptane

$4, 4$ -Bis(methyl)- $3$ -ethylheptane

Q. Which of the following is the correct IUPAC name?

3-Ethyl-4,4-dimethylheptane

4,4-Dimethyl-3-ethylheptane

5-Ethyl-4,4-dimethylheptane

4,4-Bis(methyl)-3-ethylheptane

Q. Which of the following is the correct $I U P A C$ name?

$3$ -Ethyl- $4, 4$ -dimethylheptane

$4, 4$ -Dimethyl- $3$ -ethylheptane

$5$ -Ethyl- $4, 4$ -dimethylheptane

$4, 4$ -Bis(methyl)- $3$ -ethylheptane