Question:
The IUPAC name of the following compound is
The IUPAC name of the following compound is
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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.
Updated On: Jun 18, 2026
- 2-Ethyl-2-methyl cyclobutane-1-carbonitrile
- 2-Methyl-2-ethyl cyclobutane-1-carbonitrile
- 2-Methyl-2-ethyl cyclobutyl-1-cyanide
- 1-Cyano-2-methyl-2-ethyl cyclobutane
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The Correct Option is A
Solution and Explanation
Step 1: Identify the principal functional group.
The structure contains a nitrile group \[ -CN \] attached to a cyclobutane ring.
For a nitrile group attached to a ring, the suffix used is \[ \text{carbonitrile} \] Hence, the parent name is \[ \text{cyclobutane-1-carbonitrile} \]
Step 2: Number the ring.
The carbon attached to the nitrile group is assigned number 1.
The adjacent carbon bears two substituents: \[ \text{ethyl} \] and \[ \text{methyl} \] Therefore, both substituents are present at carbon-2.
Step 3: Arrange substituents alphabetically.
According to IUPAC nomenclature, substituents are written in alphabetical order.
Since \[ \text{ethyl} \] comes before \[ \text{methyl} \] the name becomes \[ \text{2-Ethyl-2-methyl cyclobutane-1-carbonitrile} \]
Step 4: Final conclusion.
Hence, the correct IUPAC name is \[ \boxed{\text{2-Ethyl-2-methyl cyclobutane-1-carbonitrile}} \] Therefore, the correct option is (1).
The structure contains a nitrile group \[ -CN \] attached to a cyclobutane ring.
For a nitrile group attached to a ring, the suffix used is \[ \text{carbonitrile} \] Hence, the parent name is \[ \text{cyclobutane-1-carbonitrile} \]
Step 2: Number the ring.
The carbon attached to the nitrile group is assigned number 1.
The adjacent carbon bears two substituents: \[ \text{ethyl} \] and \[ \text{methyl} \] Therefore, both substituents are present at carbon-2.
Step 3: Arrange substituents alphabetically.
According to IUPAC nomenclature, substituents are written in alphabetical order.
Since \[ \text{ethyl} \] comes before \[ \text{methyl} \] the name becomes \[ \text{2-Ethyl-2-methyl cyclobutane-1-carbonitrile} \]
Step 4: Final conclusion.
Hence, the correct IUPAC name is \[ \boxed{\text{2-Ethyl-2-methyl cyclobutane-1-carbonitrile}} \] Therefore, the correct option is (1).
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