Question

The IUPAC name of the following compound is

• A. 2-Ethyl-2-methyl cyclobutane-1-carbonitrile
• B. 2-Methyl-2-ethyl cyclobutane-1-carbonitrile
• C. 2-Methyl-2-ethyl cyclobutyl-1-cyanide
• D. 1-Cyano-2-methyl-2-ethyl cyclobutane

Hint:

For nitrile groups attached directly to a ring, use the suffix carbonitrile. Also remember that substituents must be written in alphabetical order in IUPAC nomenclature.

Answer 1

The Correct Option is A

Step 1: Apply IUPAC naming rules for nitriles on rings.
Ring = cyclobutane. –CN suffix = carbonitrile at C-1. C-2 has ethyl and methyl; alphabetically ethyl first. Name: 2-Ethyl-2-methyl cyclobutane-1-carbonitrile.

Step 2: Final Answer:
2-Ethyl-2-methyl cyclobutane-1-carbonitrile (option 1).