Question

The IUPAC name of ${\mathrm{CH}}_3{\mathrm{OC}}_2{\mathrm{H}}_5$ is:

• A. Ethoxy methane
• B. Methoxy ethane
• C. Ethyl methyl ether
• D. Methyl ethyl ether

Answer 1

The correct option is B

Methoxy ethane

Explanation for correct option

(B)Methoxy ethane

Nomenclature of ${\mathrm{CH}}_3{\mathrm{OC}}_2{\mathrm{H}}_5$

• The larger (R) group is chosen as the parent hydrocarbon.
• The larger group is ${\mathrm{C}}_2{\mathrm{H}}_5$.
• The smaller group is ${\mathrm{CH}}_3$.
• So, the nomenclature of ${\mathrm{CH}}_3{\mathrm{OC}}_2{\mathrm{H}}_5$ is 1-Methoxyethane or methoxy ethane.

Explanation for incorrect option

• Common names of ethers are derived from the names of alkyl/ aryl groups written as separate words in alphabetical order and adding the word ‘ether’ at the end.
• Ethyl methyl ether or methyl ethyl ether is the common name, not the IUPAC name.
• The nomenclature of ${\mathrm{CH}}_3{\mathrm{OC}}_2{\mathrm{H}}_5$ is methoxy ethane. Hence, the incorrect options are (A), (C), and (D) are incorrect.

So, the correct option is (B). The IUPAC name of ${\mathrm{CH}}_3{\mathrm{OC}}_2{\mathrm{H}}_5$ is Methoxy ethane.